D3 Pilot’s Guide 6-1
6. PERFORMANCE NOTES
Attitude Performance
Optimal attitude performance depends on a number of environmental factors:
GPS REQUIRED
The attitude indication provided by the D3 is primarily created by combining information from
solid state MEMS-type accelerometers and rotation rate sensors, and supplemented by GPS
ground speed. In order to display as reliable an indication as possible, a GPS fix is required. The D3
will not display attitude until it has obtained a GPS fix. Once a GPS fix is obtained, it is important
that the GPS fix be maintained by either mounting the D3 in a position that affords it a good view
of the sky, or, if that is not possible (such as when using the pinch mount to panel-mount the D3),
using the included external GPS antenna.
LOSS OF GPS
The D3 requires a GPS fix to display attitude, speed, altitude, vertical speed, ground track, and
vertical speed. The D3 can cope with momentary degradations in GPS signal quality. After
approximately 2 after the loss of GPS signal, the above flight instruments will become inoperative
and removed from view.
ROTATION RATE LIMIT
The D3 will operate normally with rotational rates of up to 150 degree per second around any
axis. If a rate of 150 degrees per second is exceeded, HORIZON RECOVERING will be displayed
along the bottom of the display. The D3 will continue to display attitude information, but it should
be cross-checked against other instruments while in this recovery mode. After a few seconds of
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