Using Your D3
D3 Pilot’s Guide 4-5
GPS Ground Speed is the aircraft’s speed over the ground in knots, miles per hour, or kilometers
per hour as determined by the D3’s GPS. GPS ground speed will not match your pitot/static
airspeed instruments due to wind. Since GPS ground speed does not take into account the
dynamic pressure of the air acting on the aircraft, it does not provide the information necessary to
determine if the aircraft is close to stalling. It should not be used as a reference when landing the
aircraft.
Figure 6 - GPS Ground Speed
GPS Altitude is the aircraft’s altitude in either feet or meters as determined by the D3’s GPS. GPS
altitude will not always match your aircraft’s static system-based barometric altimeter, and should
not be used as a replacement for one.
Figure 7 - GPS Altitude
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