GPS Receivers Glossary Table of contents 2D mode Refers to Two Dimensional Mode. In this mode, the GPS receiver acquires data from at least three of the 24 GPS satellites orbiting the earth to pinpoint the user's geographical position. Three satellites are the minimum required for a GPS receiver to pinpoint a user's location. 3D mode Referring to Three Dimensional Mode. In this mode the GPS receiver displays 3D images and maps and acquires data from at least four of the 24 GPS satellites orbiting the earth to pinpoint the user's geographical position. The additional elevation reading increases the accuracy of the calculation. Accuracy Almost all GPS receivers are capable of pinpointing the user's position accurately to within 15 meters, but more advanced models are more accurate and are able to pinpoint the user's location accurately to within 1 to 5 meters. Channels Each of the 12 or more channels commonly found in current GPS receivers can connect to only one GPS satellite for positioning data. A 12 channel GPS receiver can connect to 12 GPS satellites simultaneously. DGPS DGPS is short for Differential Global Positioning System. GPS receivers supporting DGPS are capable of pinpointing the user’s location to an accuracy of within 3-5 meters. GPS GPS is short for Global Positioning System. It works via 24 satellites and GPS receivers. Generally the GPS receiver can accurately pinpoint your position anywhere in the world, and some of them also offer navigation and mapping functions. WAAS WAAS is short for Wide Area Augmentation System. It is an extremely accurate navigation system developed for civil aviation. GPS receivers supporting WAAS are capable of pinpointing a location to an accuracy of within 1-3 meters. 
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