GPS Child Locator Reviews
Child GPS Tracking Device and System
Kids are precious, but our world doesn’t design to be safe children. How can you better protect your children? One way is always know where your kids are. The GPS child locator or GPS child tracker is a must-have child safety device that allows you to locate, track, and monitor your children anywhere and anytime quickly. Use the GPS technology to keep your kids safe from predators, abductors, or kidnappers. With a GPS child tracking device, not only you can locate your kids, your children can contact you or 911 in any critical situations by pushing a button for immediate assistance.
A GPS child tracking system consists of two components: a GPS locator hardware and a real time active tracking or location based service plan. A real time location based service plan allows you to monitor the locations via Internet or phone calls. The features for a child GPS tracking device are child friendly and easy-to-use device, light weight to carry, battery life, and push a button to get help. Laipac, C TRAC GPS, Globalsat, GuardianLion, Verizon Wireless, Disney Mobile, Pantech DM-P100, and LG DM-L200 have GPS child locators available.
Don’t be regarded later. We all want the world to be safe for children without fear of predators, abductors, or kidnappers. However, in fact, our world isn’t safe for kids. Protect your kids and take the control in your hands. Check the GPS child locators today! Peace of mind.
Child gps tracking device...
Gps tracking for children ...
GPS tracking devices for children at risk, vulnerable people and the elderly.
A continual worry for many parents and carers is the location of children who may be vulnerable, or the elderly who may suffer from dementia. We are now able to offer GPS tracking for children at risk, as well as the elderly and other vulnerable people through the use of a Retrieva ™ tracking unit. This can be fixed to a belt or placed in a pocket and pre-set so that should the wearer leave a given location or go missing then the unit reports this event back to the carer via text or e-mail. The wearer can then be tracked via the web-panel or a mobile phone if necessary
The tracking device will also be available in a discreet wrist band form (late 2008) so that it can be worn on a more permanent basis by those people who are considered at most constant risk, such as Alzheimer sufferers.
All tracking devices have panic buttons that will transmit an alert and current location to any pre-defined mobile (cell) phones, and can be set to issue automatic alerts when certain events take place, such as leaving a safe area or entering an area that is considered dangerous.
lowrance iway 500c gps:Lowrance 112-362 iWay 500C Portable GPS Navigator and MP3 Player...
Product Description
Portable color GPS+WAAS navigation system shows you the way to any destination across town, or across the United States Pick your destination with the touch-screen display and the iWAY^(TM) 500C automatically displays the best route, and gives you turn-by-turn directions with voice and visual guidance. Substantial 20GByte internal hard drive, with 10GBytes allocated to built-in, high detail mapping and 10GBytes reserved for MP3 music storage to be used with the built-in MP3 player!
Finally, I have found the answer to our new vehicle purchase. We lately bought a new Ford Excusrion with completely of the bells and whistles.... almost, anyway. As Ford doesn't have a decent Nav system available, and we didnt want to give up the in-dash 6 CD changer and steering wheel audio controls, we decided to go aftermarket on the nav. I came across this unit in Las Vegas and bought it, as it offered the turn-by-turn instructions and 3D mapping I was looking for. After a 6 hour control back home, I am completely sold on the model. The unit's built very ruggedized, and looks as if it able to take a lot of punishment. The navigation performed flawlessly and found a new route fast after I decided I didn't want to go the way it told me to. The kit contains many mounting options.... a real plus! On the dash of the Excursion, the large 5" screen fits right in, without being obtrusive. I am looking into several mounting options, however. I'll be installing a seperate under-dash audio system for the nav, as I don't want to parallel the audio in with the XM modulator. Very nice unit. I hope that it holds up all the same years from now.
Garmin Nuvi 1300 GPS Navigator...
The lightweight Garmin 1300 weighs exclusively 161 grams, making it convenient to store and carry. Whether you are traveling by car or by foot, the Garmin 1300 is a great choice. The device is not considered motorcycle, trucking, or marina friendly because the device is not waterproof. The general size of the Garmin 1300 add to the instrument's attraction.
The Garmin 1300 works as soon as you open the box. The device has many maps already loaded onto it in such as European, Canadian, Hawaiian, Puerto Rican, and North American maps, as well as City Navigator?. The Garmin 1300 is packaged with a disc and windshield mount which allows the consumer to position the device on the dashboard or on the windshield.
The Garmin 1300 features a white-backlit, widescreen (480x272 pixel), TFT, touch show with WQVGA color. This device includes a rechargeable lithium-ion battery that has a four hour battery life. inside the Nuvi 130 is a highly sensitive receiver, and an internal solid state built in memory. The system allows the user to store as many as 1000 favorite locations and a microSD^(TM) (not included) able to allow him or her to store more.
The Garmin 1300 has all the essential features of any GPS from Garmin, with its voice prompt alerting the driver with the exact distance of turns which lie ahead. The Garmin 1300 has an embedded, unobtrusive speaker built in the GPS system which gives voice instructions to aid the user. The GPS can clearly state the names of streets you are about to approach; in addition it will vocalize directions for you to follow about your upcoming turns and exits.
A driver can make every trip a breeze with the Garmin 1300. The GPS can help you plan your route most efficiently and quickly, by use of automatic route selection, re-routing and allowing you to manually select definite routes. Route avoidance details assist the driver in averting unwanted toll fees or busy highways and in planning his or her road trip based on personal preferences.
As well as excellent route planning features, the Garmin 1300 provides consumers with Where Am I^(TM) features, allowing them to locate nearby important locations. The Garmin 1300 is also outfitted with a whole host of Garmin-only features like Garmin Garage^(TM) icons and custom voices, and Garmin Lock^(TM) anti-theft features too.
This GPS system is loaded with features that insure immediate ease of use, including an ABC/QWERTY keyboard and helpful photo navigation features. Better still, the user has the option of entering his or her own customized points of interest. The Garmin 1300 is completely well-suited with FM traffic and MSN Direct?, has a world clock and converter features, and a calculator for handiness The reasonably priced Garmin 1300 is easy and fun to use.
Governments Need GPS Tracking...
The difficulty of government in monitoring things under their concern is evident everywhere we look. One exclusively has to mention one hundred dollar hammers to conjure up the failures of the past that make us shake our heads in wonder. If we ran businesses in the same manner, we would be fired for incompetence.
There is one thing that government can do to stem the tide of bad management: obtain as well as implement GPS Tracking devices in completely of their most expensive assets that are on the move.
Whether it is the armed forces, or outside contractors, those organizations with significant public money tied up in vehicles and other assets need to use GPS Tracking devices. Here is how they can help:
Tracking for Location
Where are your assets located? If you have GPS Tracking implemented you can know in a matter of minutes. This is especially important for assets that contain sensitive technology that should not fall into the wrong hands. For just a few hundred dollars, you can outfit each item. This expenditure is far less than most of these items are worth and'll support you keep a tight grip on their location at all times.
Tracking for Management
Do your vehicles or assets need to be maintained on regular basis? Are you unable to view these units in person? Do you need a better method to make sure that they are brought in for necessary maintenance and repairs? GPS Tracking can give you the control that you need to make this happen. Scheduling assets for service in a timely manner helps to insure that they are running at peak efficiency and that they last longer, too.
Tracking for Recovery
Should an asset fall into the wrong hands, you can know it in an instant and send out messages to the proper authorities to recover it. Being able to bring closure to these types of situations means that you have save the public money and you the embarrassment of having to answer to why the item went undetected for so long. It is an exercise that you will not want to must face.
Tracking for Accountability
Being in control of government assets is a important business. Those who are put into these situations are expected to be able to answer for the whereabouts of the assets at a moment's notice.
There is no think that any government entity should not be using GPS Tracking to track their assets. The public has placed its trust into the government to act responsibly when it comes to these assets. That trust can be made secure by the use of these devices.
James Neely, Writer and Entrepreneur
...is a freelance writer who writes about vehicle tracking systems. Visit this link: tracking devices to find the right system to visit your needs.
The Best GPS For the Money
The best GPS for the money (automotive GPS)'ll usually be found in a clearance model once the model has been discontinued by the manufacturer. Recently, the chip sets that makes GPS units operate have not been significantly updated as well as the discontinued units still perform well. If you do not need the latest and greatest, you could find a really great buy.
When you are looking for the best GPS for the money, always look for a unit that speaks street names. The prices on these discontinued units will be low enough that you do not want to buy a unit that does not speak street names. Taking your eyes off the road to read the street name on the GPS display is extremely dangerous. Do not compromise on this feature!
Other features to look for in the best GPS for the money are screen size, MP3 player, Bluetooth, and free shipping.
For many months, the Garmin Nuvi 350 was the best GPS for the money. Its price dipped down to $160.00 in January 2009. It was loaded with features for the $160 price with standard screen size, MP3 player, picture viewer, (no Bluetooth). However, at the time of the writing of this article its price has risen to over $345 USD so forget it.
In April 2009, the best GPS for the money was the Garmin Nuvi 360. This unit has been discontinued by Garmin, but it was selling for the incredibly low price of under $150 on Amazon. It has a standard screen (2.8 x 2.1 inches), MP3 player, picture viewer, and Bluetooth.
The key point to take away from this article is there is always a best GPS for the money. You just have to know how to find it. This best GPS for the money will replace periodically as manufactures compete and as GPS units are discontinued and the stores clear the discontinued inventory.
You can find the best GPS for the money on the-best-GPS.com. It contains instructions with pictures that show how to use Amazon.com as your research tool to find the best GPS for the money.
Be a smart shopper, save a bundle, and learn how to buy the best GPS for the money.
John V. W. Howe is an entrepreneur, author, inventor, patent holder, husband, father, and grandfather. His degree in physics makes him curious about how things work and he was naturally fascinated with early GPS units and has followed their development.
This website helps readers known the best GPS units and shows how to find the best GPS for the money.
best gps on the market...
Hello,
I am nuts about Electronic Gadget's, Any Electronic Gadget, but mainly GPSs, and their good bits, bad bits, and even the ugly bits, I'll try to be as open minded and informative about them for you as possible, plus a bonus side of repair knowledge to help with the well-known good and bad, so if I could help someone and inform of the best GPSs around, which will help another person make a right decision, that is all I want, and will be pleased that I helped someone with a couple of written words of wisdom. any information is purely from my point of view, everybody writes a review of a device, but there may be a few little bits of information that make or break a decision for you. Also checkout the Blog link at the bottom of the hub for Tonnes more GPS info.
I hope I have been informative for you, in whatever way you see it..
All the best to you
Regards
Richard.
In today's fast lifestyle, we need the GPS for the speed, accuracy, and consistency of getting somewhere, and the GPS is the complete tool for the job !!!
It could locate to inside 6 feet of the destination, which is pretty good by any Mapping/compass standard's, there are different GPS for different scenario's, IE: the regular Car Driver's GPS, the Walker's GPS, the Fisherman, the dog tracker, the sailor, the pilot, the runner, the Truck Driver's GPS etc... So as you may guess, they all have different features on them, Let it be said, you get what you pay for, this is not a big surprise, this is De facto in all walks of life, So if you are thinking of investing in a GPS, Digging a bit deeper in your pocket will help in finding a better device, I am trying to inform of good bits, and the bad bits of the GPS world, and yes, a little of are good, some are bad, and some are ugly :)
But enough about me, let's talk GPS.
Pros: Lane assist alerts you to the lane to be in BEFORE the turn, Instant GPS lock right out of the parking ramp, Blue tooth, Speech recognition that actually works (unlike Garmin which I had to return)- speak the address and it WORKS!!, exclusively $400
Cons: Because it costs so much less than Garmin and has two times the features I nearly did not buy it thinking it would not be as high quality as claimed- I was plesantly suprised the Navigon is everything claimed and more
Summary: First off this thing actually has features that works. Second, you can use it in a large city and get to where you are going due to of its advanced features. When you get in the car and turn the key the device starts automatically. The voice recognition lets you speak in the destination address. The blue tooth connects to your phone letting you make hands free calls. As you control out of the parking ramp in Century City or Downtown LA the instant lock feature finds a GPS signal in seconds which is key in a downtown full of one way streets where one wrong turn means 20 minutes of time lost. Then as you get on the freeway full of bumper to bumper traffic the lane assist shows you in reality view (looks exactly the same as freeway road signs and all and has an arrow in the exact land you will need to be in to merge or exit the freeway. The included LIFETIME traffic avoids and reroutes arounds traffic back ups. Garmin charges you a yearly fee for traffic for a device with half the features and that costs twice as much. Navigon charges only $79 for three years of maps and they update the maps 4 times a year. Garmin charges $99 bucks for one map update that is 6 months to 1.5 years old depending upon when in the year you buy it (by the time they roll out the update it is 6 months old and then they sell it for the next year.
Navigon also beefed up their POI database because I had the 2100 Max before and this has way more POIs. Moreover, having full Zagot reviews for resturants is HUGE if you travel a lot like I do.
best gps value...
The siren call of technology called as well as I, its faithful servant, answered. This time, I purchased the Garmin Nuvi 200. I found it to be an excellent device.
My decision process:
All GPS devices allow you to enter addresses and guide you there. Some of the significant differences between them:
1. Bluetooth. On a GPS, Bluetooth allows you to answer phone calls from your cell phone, update traffic via that same phone, and play music.
Bluetooth calling is nice, but that feature'll cost you at least another $50.00 in the Garmin line, the Nuvi 360. I already have the $50.00 Motorola T305 which works well. I could give the T305 away to a needy California driver, but if I share the Nuvi with my wife, I'd be out two functions. Plus, I can put the T305 on my visor and I'd have to have the Nuvi 360 on my windshield the whole time (Unless space or money is an issue, it's better to have separate devices for different tasks.).
Image from Amazon
Motorola T305 Bluetooth Portable Hands-Free Speaker - Black
Image from Amazon
Garmin nA~1/4vi 360 3.5-Inch Portable GPS Navigator with Bluetooth and Text-to-Speech
2. Traffic updates. I don't concern about receiving traffic information.
3. Music. Between Sirius and my car stereo that plays mp3s and controls my iPod, I can summon any song in the well-known universe, producing anything on a GPS having to do with music a waste.
4. Points of interest. This one I care about. The Navigon 2100, my previous GPS, disappointed me when I couldn't find many of the points I find most interesting (Gaming/Comic book store, Frogurt, etc.). The Navigon 2100 has 1.3 million points of interests- not enough, apparently.
Image from Amazon
Navigon 2100 3.5-Inch Portable GPS Navigator
5. Widescreen. This seems like a gimmick to me- something meant to appeal to individuals used to their wide screen laptops. Well, the only reason to have a wide screen is to watch movies, right? On a GPS, you need to see what's ahead more than what's on the sides, si? So, why sacrifice height for width?
6. Text to speech. If it works better than telephone speech recognition (big "if"), and if you drive by yourself, this can be a great feature. You can consult for a nearby gas station or Taco Bell without pulling over. It's an not cheap extra, however. You'd have to move up the the $800.00 Nuvi 850 to get it in a Garmin product.
Image from Amazon
Garmin nA~1/4vi 850 4.3-Inch Widescreen Portable GPS Navigator
So, I go into Staples. The cheapest two GPSs were the Nuvi 200 and the Tom Tom One XL. Both were on sale, but the Nuvi was $50.00 cheaper and had the same features except for the unimportant wide screen.
Image from Amazon
TomTom ONE 3rd Edition 3.5-Inch Portable GPS Vehicle Navigator
Image from Amazon
TomTom ONE XL 4.3-Inch Widescreen Bluetooth Portable GPS Navigator (Map of US and Canada)
I opened it in the parking lot, plugged it in, and instantly got it working. I didn't need to read the manual. Initially, I had it set to just show where I was headed as I drove (I like that I now have a compass.). This is where it gets dangerous: The screen mesmerized me, and I kept taking my eyes off the road.
Unlike the Navigon, I could find the points of interest I was looking for and even gave me the phone number to most stores. The Nuvi has over three million interesting points.
The Nuvi 200 is super well-to-do to program. It anticipates states and cities as I type and guides me there through voice directions. Here's where it gets controversial: In order to pay back campaign debt, Hillary Clinton lends her honey-sweet voice to the Nuvi. I don't mind, but during long stretches, the Nuvi starts talking about health care (just kidding).
You can save destinations with one as "home" so you can find your way back from wherever you are (Advice for married men: Don't make the strip club, "home.") You can halt if you want to take a break from driving or pull into a gas station. You can also program that gas station ahead of time- it allows one per route.
The screen presents useful information like estimated time of arrival (ETA), time spent on road, and a turn list. The POI is very intuitive. The map is in 3-D or overhead. It shows digital pictures- big whoop. You can update it from the net too.
It passed the non-nerdy wife test; my wife figured it out with just a little help.
Some features I missed from the Navigon are "Lane Assist" and "Reality View" which make freeway choices clearer.
"OK," you're asking, "It works in a large metropolis like Los Angeles, but what about some primitive backwater? Would it be able to find addresses and such?"
To give it a real test, I drove to Phoenix, a wretched hive of scum and villainy next to California.
It passed. I fed it some addresses, found them, and I was on my way.
Conclusion: This is a better basic GPS, and if you don't need to the expensive frills, an excellent choice.
Vehicle Tracking Systems: Monitor Your Fleets the Easiest Way Possible...
The vehicle tracking systems are the update way of zeroing in on your moving vehicles sitting in front of the computer. The vehicle tracking systems are used in heavy numbers by the transportation companies. The vehicle tracking systems contain a device named GPS tracking system. The term GPS stands for the "Global Positioning System". In recent times it is more used for mobile phone tracking as well as even the wildlife tracking. Vehicle tracking systems are used to track down any vehicle you wish to, like cars, trucks etc. Many online service providers are providing these tracking systems, not exclusively the device but also their services.
Let's discover it a bit more
As told above, the vehicle tracking systems are used for tracking down the fleets. They contain GPS trackers. This GPS tracker has a set which is put into the vehicle. You could put it under the knowledge of the driver or without his knowledge, but in both ways you can nail the person through it. The GPS generally has the device that emits radio signals. The satellite captures those emitted radio signals. These signals are in return used to transport them back to the computers installed on earth. And it is through these computers that you can watch your fleets. The computers need no special software to run the images of the vehicles. They just need active internet connection.
The images available are up to the last detail. And you can even maintain a record of this event for future use. Through the vehicle tracking system you can scan mileage, stoppage, time of halt, path taken and speed too. All these details will tell you the exact quantity of fuel required for a trip. The vehicle tracking systems help navigate the unknown roads as well, resulting in cut down in delivery timings. With vehicle tracking systems you will score high profits with one time investment only.
Online buying of vehicle tracking systems
You can purchase online vehicle tracking systems. The online service providers also provide services of monitoring your fleets 24 hours a day for 365 days a year- at your request. Also, if you want to buy your vehicle tracking systems online you can save lot of money.
Best Hunting GPS - the Top 7 Reasons Why the Garmin Etrex Vista Hcx is the Best Hunting GPS...
Many people are asking which GPS is the best for hunting. The Garmin eTrex Vista Hcx is among the best GPS units for hunting for many reasons but here are the top seven.
1. Long Battery Life - It is essential to have a GPS unit that has a long battery life to it when hunting in the outdoors. The Vista Hcx will run approximately 25 hours on 2 AA batteries. Remember to almost always carry extra batteries in your pack while hunting so you do not get stuck in the middle of nowhere with out having replacements.
2. Compact & Lightweight - When you are doing spot and stalk hunting you will appreciate having a GPS that is both compact and lightweight. The Vista Hcx is small enough to fit in your shirt pocket and only weighs 5.5 ounces.
3. Waas-enabled & Electric Compass - It is extremely important to have a GPS that is Waas-enabled when hunting like the eTrex Vista Hcx is because it will locate your position fast and precisely even when you are hunting in heavy cover or a deep canyon. The Garmin eTrex Vista Hcx is equipped with an electric compass which will provide your bearing information even while you are sitting still in a tree stand or hunting blind.
4. Hunt/Fish Calculator & Sun/Moon Information - The Vista HCX has a Hunt/Fish calculator which tells you the best times to hunt each day. It also provides you with sunrise and sunset times so you can plan your time hunting in the field better.
5. 256 Level Color - You will enjoy the 256 level color of the Vista HCX with it's easy to read screen and great contrast that it brings to your topo maps while outdoors.
6. Great Memory and MicroSD slot - You can record 1000 waypoints, 50 routes, and 20 tracks with the Garmin eTrex Vista HCX. It has a microSD slot where you can insert preloaded microSD cards with MapSource information about the area you are hunting.
7. Water Proof - But the most important reason why the Garmin eTrex is among the best hunting GPS unit is because it is water proof. You don't want to worry about damaging your GPS unit when you are out hunting and a rain shower or snow flurries start to fall.
These are just a couple of of the reasons why the Garmin eTrex Vista Hcx is the best GPS unit for hunting.
HONDA FIT special Car DVD Player Video Audio built in vehicle GPS navigation systems,TV,RDS,steering wheel...
Product Description
Model No.: CAV-8070FT
1) 7inch TFT high clearan screen
2) Display menu operation systerm through touch function
3) CompatiblewithDVD/VCD/CD/WMA/MP3/MP4(AVI)/CD-R/CD-RW/DVD-R/DVD-RW
4) Power electronic & mechanical double anti-shock system?
5) USB/SD card insert port: obtainable with USB/SD card insert port help U disk, SD card, MMC card, with MP4 format( AVI format), MP3, WMA audio play and image browse functions;
6) TV receiving: high sensitive TV tuner, full frequency & band receiving, pre-store 80 TV channels;
7) Radio receiving: high sensitive AM/FM receiving mode, pre-setting 30 stations and programs;
8) Car reverse reminder: with car reverse video signal input, connect with sorts of reverse mirror, view the car reverse status
9) Bluetooth function: support Bluetooth wireless handsfree function,caller id display,direct dialing and clearance of voice talking circuit ;
10) Built-in GPS navigation function?optional?
11) GPS navigation functions: druing the navigation status, manual input on the touch screen to make operation more easier, instant;
12) With back control function, could outside connect display and speaker could play other video frequency and audio frequency
13) With steering whell control function, drivery have more risk less (optional)
14) Using key-press,remote control and touch-screen operation, producing operation more flexibly.
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SUAV INDUSTRIAL CO., LIMITED mainly produce the following products:
1, update design multifunctional car DVD player TV GPS
( headrest/sun visor DVD player with game, double din DVD, in-dash DVD, car TV, etc. )
2, unique video glasses private cinema
3, various latest design MP3 MP4 MP5 player
4, portable mini DVD player
Revolution in GPS: Advanced Spinning-Vehicle Navigation...
Revolution in GPS: Advanced Spinning-Vehicle Navigation
GPS-aided weapons such as the Joint Direct Attack Munition (JDAM) family of bombs have revolutionized warfare, dramatically improving accuracy and cost effectiveness, while significantly reducing collateral damage. Augmenting artillery rounds with GPS aiding could furnish similar improvements. Unfortunately, the rapid rotation on launch of many shells and rockets complicates GPS-aided guidance. This rotation could cause amplitude and phase modulation of the GPS signal, reducing navigation performance and capability of traditional anti-jam systems. Further complicating matters, traditional attitude determination techniques, utilizing inertial sensors, tend to develop significant errors at high roll rates.
To address the special navigational needs of rotating vehicles, my colleagues and I have developed a suite of GPS technologies well-known as Advanced Spinning-Vehicle Navigation (ASVN). These technologies enable high-performance, interference-robust GPS navigation as well as roll-angle determination on both rapidly spinning and slowly rotating vehicles. Potential applications include artillery shells, rockets, missiles, space vehicles, and unmanned aerial vehicles (UAVs).
Bottom-Line Drivers. ASVN provides an innovative, low-cost, compact, and robust solution to both rotation angle determination and the navigation of rapidly rotating vehicles. ASVN can:
* Improve jamming immunity by using interference to aid navigation and guidance;
* Increase range by delaying deployment or reducing the required authority of control fins and actuators;
* Reduce cost, size, and weight by eliminating or decreasing the requirements of the inertial sensing system and simplifying antenna design; and
* Enhance accuracy by enabling early GPS acquisition for improved estimation of vehicle trajectory and inertial measurement unit errors.
ASVN Technology Suite
ASVN uses the amplitude and phase modulation of the signals received by a GPS antenna on a spinning vehicle to track both vehicle rotation and improve GPS jamming and interference immunity. Analyses and laboratory and field hardware simulations illustrate the viability of ASVN technologies to reduce costs and improve the performance and capabilities of a range of spinning and rotating applications. Four core solutions comprise ASVN technology:
GPS Roll Angle Determination. Using the GPS signal modulation with rotation to measure vehicle roll angle;
Interference-Aided Navigation. Leveraging a jamming signal or interference document to aid vehicle navigation;
Temporal Beam Forming. Improving jamming resistance with only a single rotating antenna element; and
Coriolis Pitch- and Yaw-Rate Sensing. Providing inertial aiding (including rotation rates) without the use of gyroscopes.
GPS Roll-Angle Determination
In rapidly rotating vehicles (such as artillery shells and missiles), high roll rates complicate attitude determination using conventional inertial sensing techniques. Gyroscope scale factor inaccuracies trigger small roll angle errors with every rotation. At high spin rates, these errors rapidly accumulate into large errors in the vehicle attitude estimate. Added sensors such as magnetic detectors can provide an absolute roll reference, but the performance of these systems depends on the geometry of the flight trajectory with respect to the Earth's magnetic field and the magnetic properties of the vehicle.
ASVN GPS roll-angle determination (GRAD) uses the GPS signal as a reference for roll determination. The diverse geometry of the GPS constellation provides a very trajectory-independent roll reference. Because a GPS receiver typically is present in guided munitions for position determination, no additional sensors are required. The GPS signal is very weak and buried in the background noise, rendering traditional radio frequency (RF) direction-finding techniques ineffective for GRAD. However, rotation demodulators controlled by a roll-angle estimate and GPS correlators help observe the signal.
Figure 1 shows a block diagram of the GRAD receiver with rotation demodulators preceding the GPS correlators. Figure 2 shows the amplitude and phase modulation measured for an example antenna, as well as the rotation demodulator amplitude and its phase correction centered on the rotation modulation. When the estimated roll angle aligns with the actual vehicle roll angle, as shown in the figure, the rotation demodulator corrects the phase modulation and passes the largest portion of the GPS signal amplitude on to the carrier demodulator.
Two more signal-processing channels provide feedback for rotation tracking. The roll-angle control for one channel is advanced ahead of the centered roll-angle estimate and the different is retarded behind it.
When the roll estimate is properly aligned with the true roll angle of the vehicle, the correlation magnitude from the centered channel'll be maximized, and the advanced and retarded channels will be reduced in amplitude and approximately equal. The rotation-angle-tracking servo loop can accurately maintain alignment of the centered channel with the actual roll angle of the vehicle by controlling the angle estimate to keep the advanced and retarded magnitudes equal.
GARMIN 010-00403-00 Fishfinder 160C...
Designed for utility and affordability, the early Fishfinder 160C primarily targets inland boaters. The Fishfinder 160C features a sunlight readable 4.5-inch diagonal, 128 x 128 pixel, 16-color CSTN display. Garmin now offers Ultrascroll which allows boaters to get a much faster refresh rate on their sonar display. The Fishfinder 160C provides dual beam transducer operation for improved performance in shallow water or deep water. The new high dynamic range, analog receiver performs in -- as little as a foot deep. AutoGain, as well as user adjustable gain, is standard on completely of Garmin's new fishfinders showing more fish under all conditions.
I have used the [ASIN:B000ETTPCG Garmin 160C Portable Fishfinder (Dual Beam)]Garmin 160C many times now and find that it's quite well-to-do to use and it works well not only locating fish but the constant depth reading has saved my boat being hung up in shallow water areas where I fish. The optional audible alarm that I added was a plus as well so you could hear the warning of fish and depth audibly as well as look on the screen both fish and water depth situations.
Great item for the low cost!!
Garmin nüvi 265W/265WT 4.3-Inch Bluetooth Portable GPS Navigator with Integrated Traffic Receiver...
Garmin's nüvi 265WT improves upon its 200-series predecessors by adding free real-time traffic updates from Navteq (for the life of the device) as well as Bluetooth connectivity to your cell phone. Other significant improvements in the 2x5 series include a predictive technology that provides faster satellite lock, a redesigned screen with more information, terrain maps, and an exciting new photo navigation feature. The 265WT provides complete maps for North America and the handy Text-to-Speech feature, so you get turn-by-turn spoken directions with the real names of streets (e.g. "turn left in 50 feet at Nebraska Way", rather than merely "turn left in 50 feet").
The nüvi 2x5 models all sport the slim design that Garmin introduced with the 200-series last year, so they all fit comfortably in your pocket or purse, and a rechargeable lithium-ion battery that makes them convenient for navigation by car or foot. All of the models include useful travel tools like a JPEG picture viewer, world travel clock with time zones, currency converter, measurement converter, calculator and more. The 265WT also offers a wide 4.3-inch (diagonal) screen that displays 70% more of the road around you.
Important Product Information: This device features a "screen lock" feature. This is a standard feature on all nüvi 2x5 and 7x5 Garmin units. If you slide the "Power" key to the right, it will lock the screen and prevent any accidental touches. Once the screen lock feature is engaged, the screen will go black/gray after about 15 seconds to save power on the device. To unlock the screen, just slide the "Power" key to the center position. This feature is really targeted for "Pedestrian" mode so that a user can put the device in his or her pocket/purse and quickly unlock the screen instead of powering on/off continuously. For more information, see page 5 of the product manual.
I have owned quite a few GPS units all including Phone, Laptop and Dedicated. Flat out before I even get started the Garmin Nuvi 265WT is the best I have ever owned. Let me just make a couple of comments on the most important features.
Touch Screen Interface
Very intuitive and easy to use. Touch screen is responsive but not instantaneous. What I particularly like is the ability to switch to a top down view by touching the screen. Once done you can use your finger to drag the map around at any zoom point. Once done you can hit the back button and resume your 3D view.
Turn by Turn
You have two options here. You can use one of the Text to Speech voices or one of natural voices. The text to speech voices will give you more information such as street names. This is what I use and even though you can tell it's a computer generated voice its quality is superb. The 265WT does a good job at keeping you updated. Also at any time you can hit the turn Icon and it will speak the distance to the next turn, giving you street name as well as direction. The audio is quite loud and in my noisy little Scion I have no problem hearing the messages.
Maps
I have found the map accuracy quite good. I live in Northern virginal and it seems to be very well updated as many of the very new streets included.
Automatic Routing
Very effective. You can choose between the quickest or the shortest with options to avoid U-Turns, Highways, Toll Roads, Traffic, Ferries. The automatic rerouting is faster than my TeleNav phone and my Laptop computers.
Points of Interest
On my TeleNav phone GPS system I can enter any business in the national database and I can get directions, address and phone number. This is where the 265WT falls short. The TeleNav system has the advantage of searching online. Since the 265WT is limited to onboard memory there is a limit to the number of points of interest. A good example is I was looking for "Off Broadway Shoes" and the unit could not find them. However a search for "Payless Shoes" worked very well.
Traffic Alerts
The lifetime free traffic comes at a price. You will get popup adds. These are very small popups that supposedly only come when you are in the menu. This is not true. I have gotten them while in the navigation screen. For now they it seems to be once per trip but there is nothing to say they wont start getting more frequent. The other thing I don't like about the messages is that you have to hit them to continue and doing so takes you out of the nav screen to a kind of favorites screen. You have to hit the back button to get back to your navigations screen.
How well does the traffic system work. I live in Northern VA and have coverage throughout my area. The included radio fails to pick up a single signal without using an external antenna. Sadly you can just go down and purchase an FM antenna.. The Power cable has a 3/32" jack. What I did was to pick up a 3/32" plug from Radio Shack and soldered a 4' wire to the tip pin on the connector. Once draped out one of the windows I get very frequent traffic updates.
Once you start getting traffic reports I found them to be accurate and they do help. You can automatically avoid high traffic arias or do it manually as they accrue.
I am still debating if the popup adds are worth the effort.
Bluetooth Integration
This is my favorite feature. I can keep my keyboard locked Motorola Q in my pants pocket and use my 265WT to make and receive all my calls at a touch of a button. All my phone features are available on the 265WT. Phonebook, Call history, Voice Recognition. The voice quality is quite acceptable on both ends. As a matter of fact the echo I get on my Motorola is not there when using the 265WT as a hands free set.
Picture Viewer
I found this to be a very useless feature. If the photos are very big it takes forever for the 265WT to load them. This may be due to the slow access to the SD card slot.
There are other features like the ability to connect the 265WT to your PC and automatically add favorite locations using GoogleMaps. All in all I am very happy with my purchase and would purchase it again.
FYI the Nuvi 265WT is the same unit as the Nuvi 255W without the Bluetooth ability and the FM reliever cable (GTM 25). You can even purchase the GTM 25 from Garmin. If you don't want the Bluetooth feature and don't currently need the traffic feature you can pick up the Nuvi 255W cheaper.
Garmin nüvi 255W 4.3-Inch Widescreen Portable GPS Navigator
Technical Details
* 4.3 Inch Auto Navigator with Anti Theft Feature
* Voice Prompted Turn by Turn Directions
* With HotFix, It Calculates Your Position Faster to Get You There Quicker
* Compatible with Optional Enhanced MSN Direct Content
* JPEG Picture Viewer, World Travel Clock, Currency Converter, Calculator and More
Product Details
User's Guide [1.34mb PDF] | User's Guide [652kb PDF]
* Product Dimensions: 4.8 x 2.8 x 0.8 inches ; 1.2 pounds
* Shipping Weight: 2 pounds (View shipping rates and policies)
* Shipping: Currently, item can be shipped only within the U.S.
* ASIN: B0015EWMX8
* Item model number: Nuvi 255W
I actually could not decide between the Garmin Nuvi 255w or the 750 model, so I decided to buy them both for comparison. I mounted them both to my car windshield and gave them various addresses to find together. I found that both models took the same routes and announced upcoming turns and street names at practically the same time. One thing I noticed about the 255w was that it was updating my position on the road more often, I'd say about 3 times as often as the 750. This made for smoother graphics on the 255w of the vehicle moving along displayed roads, where the 750's display was more of a "jerky" movement. I also found that the display on the 255w was a bit brighter, clearer, and more vivid than on the 750 in both daylight and at night. Another feature I like on the 255w is the graphic turn indicator in the upper left corner, which the 750 lacks. This is a small arrow which shows upcoming turns and the distance to that turn. It also show things like a fork in the road, (ie: a Y intersection), and which fork you will be taking. The 750 just displays text on the top line for upcoming turns without the arrow. It's just a little extra feature on the 255w which I happened to really like. The 255 also automatically adjusts the font size of displayed text so that even lengthy text will fit.
Another feature on the 255w is a display of the posted speed limit on the road which you are currently on right above your current displayed speed. I found myself not even looking at my car speedometer as I could easily see my current speed and the speed limit of my route at a glance. The 750 doesn't have this feature. I also like how they moved the zoom in (+) and zoom out (-) buttons on the 255w to the same side of the screen which makes it a bit easier. On the 750 the zoom buttons are on opposite sides of the screen.
Now there are some features on the 750 that the 255w does not have. The 750 can broadcast it's sound over your FM radio with the supplied cigarette lighter cable, and it has a headphone jack, which I found to be nice features. The 750 also has an MP3 player and an Audio-book player, which the 255w does not. Another really nice feature of the 750 is the car locater. This is a great feature if you are parking in a really big lot, such as at an amusement park or a fair. The 750 marks your location when you remove it from the car, then you take it with you and it remembers where you parked and takes you right back to your car. The 255w doesn't have the car locater.
I also thought the the voice prompts of the 750 where more pleasant sounding than the 255w's. The 750 sounds more like a real female voice, where the 255w sounds more robotic.
Another thing to consider was that I paid $50 less for the 750 and it came with the FM transmitter cable and a USB cord to connect it to your computer for updates and downloads.
My final decision was to keep the 255w and return the 750 because I really liked the graphic turn indicator and the posted speed limit and current speed indicators. I didn't find a need for the 750's MP3 player and Audio book player, but that is up to personal preference. Since the USB cable was not included with the 255w, I purchased it on this site for $10. I also intend to purchase the MSN direct cable when it is available in August 2008.
Garmin nüvi 780 4.3-Inch Widescreen Bluetooth Portable GPS Navigator with MSN Direct Service
Technical Details
* GPS Navigator Preloaded w/City Navigator North America NT
* 4.3 in Diagonal Touchscreen Display with 2D/3D Mapping Perspective
* Turn by Turn Directions with Voice Guidance/ Text to Speech Feature
* Includes MSN Direct Receiver with Version 2
* 1.8 Lbs (WxLxH) 0.8" x 4.8" x 2.8"
This is my first automobile GPS, and I did a lot of research before settling on the Garmin 780. I live in the Washington DC Metro area, so all of the extra features work here. Upon its arrival, I downloaded and installed the latest Garmin WebUpdater v.2.41 and then updated my 780 from software version 2.50 to 2.90. I also updated the Bluetooth and other firmware, along with the languages that I use. This all worked flawlessly in a Windows XP virtual machine on a Linux host. FWIW, the 780 will charge off of the supplied USB cable.
The 780 acquired the necessary satellites in just a few minutes when first activated, and does so in less than a minute for subsequent activations. I found the screen brightness to be fine for both day and night. I'm using the 780 with the Garmin Portable Friction Mount. Smashing windows and stealing GPS devices is the sport of choice in the DC Metro area, so I wanted no evidence of a GPS extant when I left the car. The friction mount works perfectly on my Honda Accord dashboard and stores easily in the center console, leaving no trace of a GPS behind. Very cool. The 780 easily fits in a shirt pocket, so it's not necessary to leave it in the car.
I tested the 780 immediately by driving during rush hour to a residence across the river in a tangle of park roads off of the beaten track, then returning at night. The Garmin had no trouble creating a very fast route to the destination that bypassed most of the heavy traffic during rush hour. On my return, I bypassed a turn on its preferred routing. It recalculated a new route in less than a second which was the exact right answer. The new route wasn't a recapture of the original route, which wasn't possible from that location, but an entirely new route. The routes it picked were appropriate for the times of day traveled, which can be a daunting task here if you don't know which roads go which direction during the appropriate rush hour. DC is a notoriously difficult area to navigate, but so far the Garmin seems up to the challenge.
I found the volume of the internal speaker to be more than adequate even with the radio, air conditioning, and windshield wipers going. Voice notifications led upcoming turns by an adequate amount, and the voice prompts always helped me get into the correct lanes in plenty of time for upcoming turns. During a particularly tricky section where several major roads converge on a bridge, then diverge on the other side, the Garmin gave almost constant appropriate guidance to ensure that I took the correct forks and turns. I was quite impressed.
The Bluetooth paired quickly with my Motorola Razr V3. It even provided its PIN code at the appropriate time. The phone functions work great and it's easy to hear over the 780 speaker. The party on the other side of the phone said that I sounded like I was in a tunnel, which is typical for remote devices for autos. I have another BT hands-free device and it garnered the same comments. The Garmin's on-screen phone cues make hands-free easy.
Activation of the MSN Direct service was simple over the Net. On initial activation of your free 3 month trial, they offer a 6-month extension for $9.95 which gets you to 9 months of service total for less than $10--a very good deal. MSN Direct information took a while to load the initial information, but then it said that in the Quick Start pamphlet. Once loaded, the traffic, weather, and news worked great. Gas prices were behind by several days, which is an eternity these days. My favorite (and cheapest) station wasn't listed.
Overall, I'm very happy with the 780. I'll be working it out heavily in the coming weeks, including on a road trip to another city with MSN Direct service. I can't believe that I waited this long to take the plunge to a GPS device for my car. Even though I'm a master with maps, the Garmin suggested a clever routing that I did not previously discover on my own. From what I've seen so far, the 780 will be a highly valued addition to my road warrior kit bag. I can recommend the 780 without reservation.
Garmin nüvi 500 3.5-Inch Portable GPS Navigator...
The nüvi 500 comes preloaded with the highly detailed City Navigator North America NT maps for the lower 48 states, which also includes topographic maps for a better perspective of your elevation. The map data, provided by NAVTEQ, features over six million points of interest, including hotels, restaurants, gas stations, ATMs and attractions.
Alright, so it could've had save-able tracks and it is NOT an Oregon for off-road but it is an amazing crossover system. I have uploaded 500 geocaches using the premium member feature from Geocaching.com: Pocket Queries. I set a point in a field behind my house using Google earth and then sent the coordinates via USB cable to the Nuvi 500. It got me within 20 feet. Not too bad, I would say. Even tiny family owned local stores show up on the Nuvi 500 maps. Its super easy to switch between road maps and the topo map feature, just click off of the road map to switch to touch navigated topo maps. The more you zoom in, the more POI's show up. As far as i can tell Garmin loaded every POI my hometown has to offer and if it isn't on the map, chances are you can search for it on the Nuvi 500 and find it. It's perfect for me, a young driver, going off to college with big interests in being out of doors and also wanting turn-by-turn directions to get where im going. I'm a new Geocahcer and the dedicated Geocaching feature seems flawless. At time the Nuvi 500 seems a little bogged down with processing information but settings of detail levels can help speed up the process. The compass feature seems to work decently, however i rarely us it, relying instead, on zooming in on the topo map as i get closer to a geocache to find my way. The Nuvi 500 hooks up to my Mac, is quickly recognized and then opens as a removable mass-storage device with just under 1GB of free space. (500 .GPX files takes up only 5-600Kb). There is a picture viewer, you can send addresses and coordinates from google maps straight to the device and the street level mapping even in large cities seems flawless. No new maps or major firmware updates are available yet. Overall, it is an amazing system and worth every 385$ i spent on it. (much cheaper than 500$ at best buy).