Behaviour of GYRO at high latitude ?

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FOLLOW

EFFECT OF IMPERFECTION IS MAGNIFIED
LAT ADJUST BECOME CRITICAL
SPEED ERROR INCREASE DUE TO DECREASE OF ROATIONAL SPEED OF EARTH.
BALLASTIC DEFLECTION INCREASE
COMPASS IS SLOW TO RESPONSE TO CORRECTIVE FORCES
GYRO BECOME USE LESS AFTER 85 DEG LAT
DAMPING ERROR IS EQUAL TO TAN LAT.
GYRO CONTINUESLY LOOSE HER HORIZONTAL FORCE AFTER 85 DEG