I have to admit, van, that it was "force of habit" to use the horizon as my base...because thats what I do with real sextant. Sorry for the confusion.
Accuracy at sea is a relative thing. Kriegsmarine grid squares were 6nm x 6nm (at their smallest). Anyone on the tower could see anything within those squares, at least "smoke on the horizon" for sure.
When the Naval Academy taught Cel Nav, their standard was accuaracy to within 0.5nm. (1000yds).
Cheers,
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