B-2
Velocity/time terms:
GS
Ground speed. GS is the speed measured relative to the ground;
also known as velocity over ground (VOG).
VMG
Velocity made good. VMG is velocity in the direction of the desired
course. It is the speed at which you are closing on the “active to”
waypoint.
ETE
Estimated time enroute. ETE is the time it will take to reach the
“active to” waypoint based on VMG.
Direction terms:
DTK
Desired track. DTK is the course between the “from” and “to”
waypoints.
BRG
Bearing. BRG is the direction from your position to the “active to”
waypoint.
CTS
Course to steer. CTS is the recommended direction to steer in order
to reduce cross track error and stay on course (see Section B.2 for
an example using CTS).
CMG
Course made good. CMG is the bearing from the “active from”
waypoint to your position.
TRK
Track. TRK is the direction of movement relative to the ground.
TRN
Turn instruction. TRN is the difference between BRG or CTS
(whichever you have displayed) and TRK. “L” indicates you should
turn to the left, “R” indicate you should turn to the right. The degrees
indicate the angle you are off course.
Distance terms:
RNG
Range. RNG is the great circle distance from your position to the “to”
waypoint.
DMG
Distance made good. DMG is the distance from the “active from”
waypoint to your position.
STR
Steer direction and distance. “L” indicates you should steer to the
left, “R” indicates you should steer to the right. The distance
indicates how far you are off course.
