simple, lock onto a ship, turn TDC on, and then OFF, unlock ship, relock on ship, turn on TDC...
again:
LOCK--> TDC ON--> TDC OFF--> UNLOCK--> LOCK--> TDC ON.. this should have new readings.. either ways you are also left with the dot method..
Take care to check the depth settings since they get stuck sometimes.. also, AoB setting starboard not triggered unless clicked on port, then starboard (upper right quadrant)..
I think this is intentional, since these devices were unreliable at the time.. or maybe battered by shells so malfunction every once in a while.. WHAT???!!! like fresh start off base?? yeah...
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