Corrections are not applied for the
effects of secondary precession, vertical velocities or real drift of the gyros
which rules out movement in the yawing plane, secondary precession and
pendulous oscillation, vertical velocities, earth precession, centrifugal
forces and transport drift and gyroscopic inertia, earth rotation and real
drift.
Corrections are made for the effects
of aircraft manoeuvres (the platform is always kept
in the local horizontal), for apparent wander of the gyros (Earth rate and transport
wander) and for the effects of coriolis on the
accelerometers.