Raymarine Autohelm ST 30 - 6.4 Calibration Lock;Unlock

6.4 Calibration Lock/Unlock
The lock/unlock feature removes the risk of accidentaliy changing the set
calibration values.
For securii, the calibrabon lock/unlock feature is accessed by an
extended hold down of the 4 and Dfspfay keys as follows:
1. Press and hold Diiplay and %T for 14 seconds until CAL is displayed
for tie second time.
2. Press A and V momentarily.
f, I