Each of these listings are taken from ebay auction sites among the top shopping web pages on the world wide web. We have pre-arrainged these item listings. Make sure you examine each description before you purchase any Marine GPS .We hope you love your acquiring on our web pagesSo there is certainly no valid reason to pay too much for Marine GPS when you can find many of them that you can buy on eBay. Plus, eBay is probably the largest and most trustworthy internet shopping sites in the world. This website is sanctioned by eBay to make it easier to get the Marine GPS you are hunting for and show them for you. If you do not see the Marine GPS browsing for below. Use the search function on your right, or use one of the recent Marine GPS search terms in the list.

 

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How GPS Technology Works

The 27 satellites that are collectively known as the Global Positioning System have flight patterns that make four satellites available to a GPS receiver at any time any where in the world. A GPS receiver must be able to contact and communicate with a minimum of 4 satellites to be able to calculate minimally qualified location data. The larger the number of satellites a GPS receiver can contact the better it will be able to calculate a location.

In order to triangulate a geographic position a GPS receiver calculates the time that it takes for the signal of the GPS satellite to reach the GPS receiver. From this data the GPS unit is able to calculate the distance to each satellite. The time distance information is then used by the mapping software on the GPS receiver unit to determine an exact location on earth.

Satellite signal degradation from both natural and man made obstructions can affect how accurate a GPS unit is. This is why GPS units will try to contact as many GPS satellites as possible. The more satellites the GPS unit is able to contact the more accurate the location.

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