Well I've got credit while being submerged below periscope depth, so I know you can get credit without visual, but basically if you can see it or hear it, you'll get credit. I'm pretty sure if the watch officer can see it, then you definitely will get the credit. I'm not sure if going real deep makes a difference, but I try to keep checking hydrophone. If it's dead in the water, I'm not sure if you need visual contact or not. Maybe somebody else around here knows more.
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