Dynon Avionics D1 - Manual (Page 17)

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D1 User Guide 4-3
GPS Ground Speed is the aircraft’s speed over the ground in knots, miles per hour, or kilometers
per hour as determined by the D1’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 4 - GPS Ground Speed
GPS Altitude is the aircraft’s altitude in either feet or meters as determined by the D1’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 5 - GPS Altitude
GPS Ground Track is the direction that the aircraft is moving over the ground as determined by
the D1’s GPS. It is displayed both numerically and as a graphical arc. GPS ground track is adjusted
for estimated magnetic variation rather than being aligned to true north. However, GPS ground