HOLD key - Depress and check illuminated.
Coordinates in data display shall freeze at values
present when Hold key was pressed.
While HOLD key is illuminated, TACAN,
GPS, and data link updates are inhibited
UTM Inertial Position - Check as follows:
Data selector - UTM WYPT (check HOLD key
Left-hand display - Read northing in kilometers.
Right-hand display - Read zone and easting in
Compare with values from UTM Position
INSERT/ADVANCE - Depress.
Right-hand display - Read zone and extra precision
easting values to the nearest meter.
HOLD key - Depress to return the INS to normal
operation HOLD key will dim.