Tuesday, 27 January 2009

How Does Your Garmin Handheld GPS work?

Have you ever wondered how your Garmin Handheld GPS works? If you have, then here is the answer. Twenty four GPS satellites circle the earth twice a day. They do so in precise orbits and transmit signal information to earth.

Garmin Handheld GPS receivers take this information and use triangulation to calculate the user's exact location. The Garmin Handheld GPS receiver compares the time difference between when a signal was transmitted by a satellite with the time it was received. This time difference helps the Garmin Handheld GPS receiver to calculate how far away the satellite is. The Garmin Handheld GPS uses the same system to measure the distance from a few more satellites. With this data the receiver can determine the user's position and display it on the unit's electronic map.

A Garmin Handheld GPS receiver must be locked on to the signal of at least three satellites to calculate position on Earth and also to track movement. With the help of four or more satellites in view, the Garmin Handheld GPS receiver can determine the user's exact latitude, longitude and altitude. Once the user's position has been determined, the unit can calculate other information, such as speed, bearing, track, trip distance, distance to destination, sunrise and sunset time and more.

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1 comment:

  1. What is amazing about the satellites is that they stay in such an accurate orbit. For a gps unit to display information that is accurate within a meter each and every time is technology at it's best. When Sputnik was launced who would have dreamed we would receive all the information from satellites we do. GPS is becoming more and more mainstream for the public. I expect within a few years that a cell phone that is not gps enabled will be a dinasour.

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