The only purpose is to not be spotted between range readings. Personally, I make almost nothing but submerged attacks, but that's because I like to get in really close and you'll be spotted there even at night. Besides, I get my range readings from the radar, and almost never use the stadimeter at all.
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We, the unwilling, led by the unknowing, are doing the impossible for the ungrateful. We have done so much, for so long, with so little, that we are now qualified to do anything with nothing.
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