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Almanac Data
—
Satellite constellation information (including location and health of
satellites) that is transmitted to your receiver from every GPS satellite. Almanac data
must be acquired before GPS navigation can begin.
Bearing
—
The compass direction from your position to a destination.
Course Over Ground (COG)
—
Direction of movement relative to a ground position.
Crosstrack Error (XTK)
—
The distance you are off 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)
—
The time of day of your arrival at a destination.
Estimated Time Enroute (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 north/south measurement of position perpendicular to the earth’s
polar axis.
Longitude
—
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.
SECTION
G
APPENDIX
Glossary
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