Garmin GPS 120 - Manual (Page 61)

Almanac Data —Satellite constellation information (including location and health of
satellites) that is transmitted to your receiver fmtn every GPS satellite.
Almanac data must be acquired before GPS navigation can begin.
Bearing— The compass direction from your position to a destination.
Course Made Good (CMG) —The bearing from the 'active from’ position (your starting
point) to your present position.
Crosstrack Error (XTE) —The distance you are olí a desired course in either direction.
Desired Track (DTK) —The compass course between the ‘from’ and ‘to’ waypoints.
Differential GPS (DGPS) —An extension of the GPS system that uses land-based
radio beacons to transmit position corrections to GPS receivers.
Estimated Time of Arrival (ETA) —Tbe time of day of your arrival at a destination.
Estimated Time Enronte (ETE) —The time left to your destination at your present speed.
Grid —A coordinate system that projects the earth on a flat surface, using square zones for
position measurements.
Ground Speed —The velocity you are travelling relative to a ground position.
Latitude —^A norih/south measurement of position perpendicular to the earth's polar axis.
Lon^tnde —An east/west measurement of position in relation to the Prime Meridian, an
imaginary circle that passes through the north and south poles.
Position —An exact, unique location based on a geographic coordinate system.
Track (ТИК) —The direction of movement relative to a ground positbn.
Universal Transverse Mercator- (UTM) — A grid coordinate system that projects
global sections onto a Hat surface to measure position in specific zones.
Velocity Made Good (VMG)— The speed you are closing in on a destination along a
desired course.
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