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B-2
Velocity/time terms:
GS Ground speed. GS is the speed measured relative to a ground
position; 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.
ETA Estimated time of arrival. ETA is the estimated time you will
reach the “active to” waypoint based on VMG. This time is
selectable as either UTC or local.
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 a ground
position.
TRN Turn instruction. TRN is the difference between BRG 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
“active to” waypoint.
DMG Distance made good. DMG is the distance from the “active from”
waypoint to your position.
XTK Crosstrack. XTK is the cross track error, or distance that you are
off course. If the crosstrack error exceeds the CDI scale setting,