Quote:
Originally Posted by Trevally.
The Red Marker.
Start timing as ship touches the centre scope line.
Do not move scope.
You must be at 0 knots
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I missed this since I did not follow this thread as ofthen as a week ago. If your periscope is pointed along the Sub/U-boat's centerline then you can have any speed. In other words turn towards it (or away) and have periscope at 0 (or 180) degrees.

Though uboat rolling due to waves might cause problems with this method.