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GPS Terms
GPS Terms and Definitions
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. |
Waypoint | A waypoint is a saved set of co-ordinates |
Track | The direction you are moving in. Also called a Heading. |
Route | A series of one or more waypoints. |
Bearing | The direction from where you are to where you want to go (GOTO) |
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. |
WAAS | Wide Area Augmentation Service - available in newer GPS's. Improves positional accuracy. |
DGPS | Differential GPS - A technique for improving gps solution accuracy |
Selective Availability | A process that allows the DoD to limit the accuracy available to GPS users |
Spoofing | The deliberate transmission of fake signals to fool a GPS receiver |
WGS-84 | World Geodetic System of 1984. a reference system for global navigation and measurement. Used by the NAVSTAR GPS system |
Arc second | 1/60 of an arc minute |
Arc minute | 1/60 of a degree |
Statute Mile | A unit of distance equal to 5280 feet. It is sometimes referred to as a land mile (1.609 km) |
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 |
ETA | Estimated Time of Arrival (when you will get there) |
ETE | Estimated Time Enroute (how long before you get there) |
Latitude | an imaginary line around the Earth parallel to the equator |
Longitude | Measurement east or west of the prime meridian in degrees, minutes and seconds |
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 |
Greenwich Meridian | same as Prime Meridian |