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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 trasmitted by a satellite with the time it was received. The time difference tells the GPS receiver how far away the satellite is. With distance measurements from a few more satellites, the receiver can then determine the user's position and display it on the unit's electronic map. Once a user's position has been determined, the GPS unit can calculate information, such as vehicle speed and diagnostics, bearing, track, trip, distance, distance to desination, sunrise, and sunset times and much more.
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Altina
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Garmin
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Hit the highways and never look back with our portable street navigators. There's an easy-to-use navigator for any vehicle — and any budget.
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