Pretty much anything that isn't the static environment - if it's not water or bottom, it's visible. Exceptions are things above water, and possibly a few things below. Clue is, you have to be fairly close. You're supposed to have detected them already. IRL its use would also be detectable by others in the vicinity.
Unfortunately, it's not good to use for plotting moving objects. You can get a marker, but until that marker is gone you cannot remark it. (It's just extra work, though)
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