Thanks! Yes, in rough weather that may be a good alternative to using the stadimeter. I don't use stabilize view, so rocking of my own boat and water washing over the periscope make using the stadimeter very difficult in those conditions. But that's probably the way it was. 
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On sailor's grave there are no roses,
On a seaman's grave there blooms no Edelweiss.
The only ornaments are the white gulls
And the many tears a girl is weeping.
-- German folk song, sung by German seamen during the war.
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