It would be mounted between the air search radar mast and the rear AA gun and ideally it would be on the centreline, so it could be sighted for accuracy on the jack staff. The Bowfin has one on her website page virtual tour, the Cobia and Silversides both have one on them as well.
The Bowfin virtual tour of the aft end of the conning tower has a nice close up view with binoculars attached, but that one appears to have been installed off centreline.
EDIT: I don't know 100% about them being installed on all classes of boat, perhaps DaveyJ would be able to help out with that one?
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