Garmin GPS 90 - Manual (Page 81)

Track (TRK)—The direction of movement relative to a
ground position.
Universal Transverse Merc a t o r- (UTM)— A grid
coordinate system that projects global sections onto a flat
surface to measure position in specific zones.
Velocity Made Good (VMG)—The speed you are clos-
ing in on a destination along a desired course.
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Appendix E
Glossary
The diagram below illustrates some of
the basic navigation terms used with
the GPS 90.
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