3.10.1 Means should be provided to enable the
display to be stabilized in azimuth by a gyro-compass, or its equivalent
in performance. The accuracy of alignment with the compass transmission
should be within 0.5° with a compass rotation rate of 2 revolutions
per minute.
3.10.2 The equipment should operate satisfactorily
in the head-up unstabilized mode when the azimuth stabilization is
inoperative.
3.10.3 Change over from one display mode to the
other should be possible within 5 s and achieve the required bearing
accuracy.