What is a GPS
How it works
GPS satellites circle the earth twice a day in a very precise orbit and transmit signal information to earth. GPS receivers take this information and use triangulation to calculate the user's exact location. Essentially, the GPS receiver compares the time a signal was transmitted by a satellite with the time it was received. The time difference tells the GPS receiver how far away the satellite is. Now, with distance measurements from a few more satellites, the receiver can determine the user's position and display it on the unit's electronic map.
Garmin 010-00401-10 StreetPilot c330 3.5-Inch Portable GPS Navigator
With a simple touch screen interface, automatic route calculation to any destination, and turn-by-turn voice-prompted directions, the StreetPilot c330 GPS navigator is a powerful companion for your adventures on the road. Plus,
Garmin has designed the "c-series" of car navigation units to be as simple and easy-to-use as possible-- no more intimidating features, just straightforward, basic navigation at your fingertips. Selecting a destination is as simple as a few finger-strokes, and you can choose between a three-dimensional navigation view or the more traditional
Amazon Price: $299.99 (as of 07/13/2009) 
Garmin nüvi 350 3.5-Inch Portable GPS Navigator
What if one device could help you navigate anywhere in the U.S. and Canada, while offering travel tips, storing your favorite tunes and photos, providing translation assistance, and more? That device is here, and it's not much bigger than a deck of cards. The Garmin nüvi 350 is set to revolutionize what we expect from a GPS navigation device, or from any device for that matter.
Amazon Price: $279.99 (as of 07/13/2009)
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