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TTG Time To Go (TTG) is the measurement
of how long it will take you to arrive at
your destination. TTG is based on how
fast you are moving towards the
destination and the distance remaining.
True North The direction to the geographical
North Pole from an observer’s position.
The north direction on any geographi-
cal meridian.
UT Universal Time, formerly referred to as
Greenwich Mean Time (GMT).
UTM Universal Transverse Mercator (UTM) is
the metric grid system used on most
large and intermediate scale land
topographic charts and maps.
XTE Cross Track Error (XTE) is the
distance, left or right, of the desired
courseline. The courseline is a straight
line from your present position to your
destination.