GPS Navigation: a Smart Way to Search the Way

Go from box to boat to dash with the portable and versatile GPSMAP 478. This combination color chartplotter and land navigator comes preloaded with U.S. marine charts utilizing elements of the latest BlueChart g2 technology, in addition to detailed street-level mapping. Optional weather and sonar capabilities combined with the ability to conveniently add plug-in data cards, let you easily add more maps and features - making this one incredible GPS navigator for land and sea.PRODUCT FEATURES:Accepts the latest (optional) BlueChart g2 data cards;Add optional GSD 21 for full-feature sonar capability;Add optional GXM 30 antenna for XM WX Satellite Weather;Provides tides and built-in celestial information;NMEA 0183 input and output;Removable quad helix antenna;Single knob tilt/swivel mount.
Customer Review: Not great
I bought and used this plotter over the summer of 2008 in Maine. While better than nothing the screen is really too small to be useful. If you zoom out to get a range of a few miles, you lose chart detail. The screen keys on the cursor, and it can then be difficult to find the arrow indicating the boat position again. I would have returned it, but Amazon has only a 30 day return policy on unused items. So you buy it and try it, you own it. Unless you have a very small craft, buy a plotter with a larger screen.
Customer Review: Garmin GPSMAP 478
Fantastic. Easy to use both on and off the water. The auto-zoom is wonderful when driving. Worth every penny.


GPS or Global Positioning Systems are a breakthrough in technology. Earlier, people used to spend great deal of their times in searching a place or choosing the right path to the desired location. Now, with the help of technology, they can have a guide in their hands, which will help them to reach the exact location. Global Positioning System is a miniaturised version of Global Navigation Satellite System. The GPS uses a great deal of technology to make they owner reach the place for he is looking for comfortably. It’s officially known as NAVSTAR GPS. The GPS satellite constellation is managed and carried over by US Air Force.

The GPS works out by carefully timing the signals received through constellations of GPS satellites which are placed high above the earth.

GPS devices are composed of antennas tuned to the frequencies transmitted by these satellites. It also has a time calculator and receiver processors which perform the work of decoding.

One most extensively used GPS device is SATNAV GPS Navigations System which is Satellite Navigation System. These can be mainly found in the latest mobile devices. These are more of handy and follow the same criteria of working. SAT NAV GPS Navigations have an extensive networks and it helps the user to trace the paths if ever he gets lost. These devices ensure that the user never gets lost. No matter, where he is, he can use this device to find the correct location of any place. The accuracy level of these devices is commendable.

Moreover, these devices come in a user friendly cost. He can avail these devices with great ease and comfort. These devices greatly help the user to trace directions and locate places. They indeed prove to be a great source of help to the user especially when he has lost the path. The stylish bodies and user friendly interface helps the user to easily reach the desired place with great convenience.