Dynon Avionics D2 Pilots User Guide - Manual (Page 31)

D2 Pilot’s Guide 7-1
7. PERFORMANCE NOTES
Attitude Performance
Optimal attitude performance depends on a number of environmental factors:
GPS REQUIRED
The attitude indication provided by the D2 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 D2
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 D2 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 D2),
using the included external GPS antenna.
Loss of GPS
Lapses in GPS coverage may degrade attitude accuracy, depending on the length of the outage.
During short lapses, the message GPS LOST: CROSS-CHECK HORIZON will appear at the bottom of
the display to indicate that the D2’s attitude indication may be degraded and should be
interpreted cautiously. Additionally, the indications that rely solely on GPS will be replaced with
red Xs.