Well its an interesting find, im not sure it could be implemented as a functional mod though, to have it working correctly you would need to be able to add new cameras which the game will not allow as far as i know.
I guess perhaps you could swap the watch officer`s binoculars for the range finder when you give the order to find the range to nearest contact, trouble being that we cant adjust his animation to look as if he is holding the thing, his hands would still be posed for binoculars.
Similar to that old sextant tool i guess you could have a static graphic of the range finder that you can drag on screen at the appropriate time but it would be entirely non functional, at least the slideout sextant was a usable tool, the rf would just be a pretty picture.
Third option i guess is to just add a model of the rangefinder to the conning tower somewhere, just propped up against a bulkhead etc to suggest its use by the WO. It could be given a "visible underwater" controller so it would dissapear when submerged.
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