Garmin GPS III Plus - Manual (Page 106)

To Course—The recommended direction to steer in order to reduce
course error or stay on course. Provides the most efficient heading to get
back to the desired course and proceed along your route.
Track—The direction of movement relative to a ground position. Also
referred to as ‘ground track’.
Trip Odometer—A running tally of distance travelled since last reset.
Also see ‘Odometer’.
Turn—The angle difference between the bearing to your destination and
your current track. ‘L’ indicates you should turn left, ‘R’ indicates you
should turn right. The degrees indicate the angle you are off course.
VMG—Velocity Made Good. The speed you are closing in on a destina-
tion along a desired course. Also referred to as the ‘vector velocity’ to
your destination.
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APPENDIX G
Navigation Terms
WPT 1
Course Error
NORTH
WPT 2
Bearing
Speed
Distance
VEHICLE
Course
Track