Using Your D3
4-6 D3 Pilot’s Guide
GPS Ground Track is the direction that the aircraft is moving over the ground as determined by
the D3’s GPS. It is displayed both numerically and as a graphical arc when using the Classic style. In
TRK Overlaid mode, it is depicted as a circular compass-style indicator overlaid on the attitude
indicator, with the numerical track above the roll scale. GPS ground track is oriented to magnetic
north - not true north - similar to your magnetic compass. However, due to winds, GPS ground
track will usually not match the heading provided by your aircraft’s magnetic heading
compass/instrument. Therefore, the GPS Ground Track indication should not be used as a
replacement for a magnetic heading instrument.
Figure 8 - GPS Ground Track Arc Classic (left) / Track Overlaid (right)
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