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GPS Terms and Definitions

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Term
Definition
GPS   GPS (Global Positioning System) is a navigation technology that provides precise time and location anywhere, anytime and under any atmospheric conditions, by using the NAVSTAR satellites.  
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Waypoint   A waypoint is a saved set of co-ordinates  
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Track   The direction you are moving in. Also called a Heading.  
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Route   A series of one or more waypoints.  
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Bearing   The direction from where you are to where you want to go (GOTO)  
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GOTO   GPS feature to plot the bearing and distance to some waypoint. Careful...this is a straight line and doesn't necessarily indicate the best route to take.  
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WAAS   Wide Area Augmentation Service - available in newer GPS's. Improves positional accuracy.  
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DGPS   Differential GPS - A technique for improving gps solution accuracy  
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Selective Availability   A process that allows the DoD to limit the accuracy available to GPS users  
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Spoofing   The deliberate transmission of fake signals to fool a GPS receiver  
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WGS-84   World Geodetic System of 1984. a reference system for global navigation and measurement. Used by the NAVSTAR GPS system  
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Arc second   1/60 of an arc minute  
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Arc minute   1/60 of a degree  
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Statute Mile   A unit of distance equal to 5280 feet. It is sometimes referred to as a land mile (1.609 km)  
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Nautical Mile   A unit of length used in marine navigation that is equal to 1 arc minute of a great circle on a sphere. One international nautical mile is equivalent to 1,852 meters or 1.151 statue miles  
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ETA   Estimated Time of Arrival (when you will get there)  
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ETE   Estimated Time Enroute (how long before you get there)  
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Latitude   an imaginary line around the Earth parallel to the equator  
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Longitude   Measurement east or west of the prime meridian in degrees, minutes and seconds  
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Prime Meridian   An imaginary line running from north to south through Greenwich, England, used to measure longitude. The prime meridian is at zero degrees longitude  
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Greenwich Meridian   same as Prime Meridian  
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