Your true position matters very little. All that matters in game is your position relative to the convoy, and other u-boats. Once you're in sight of the convoy, when surfaced your position relative to the convoy can be reasonably accurately determined. Once submerged, this becomes harder but you can still plot it via observations from 'scopes and hydrophone. Once deeper than periscope depth, only a log of headings and times can plot your positions, augmented by hydrophone readings.
As the game already operates thus, it's hard to see why disabling the surfaced position indicator would serve any purpose at all.
Hence my quip about "damp-paper".
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