It only works on the surface too. I find it's good in the early part of the war in thick fog since you can remain surfaced and get a fix on the target without submerging. Still it's field of view is tiny and using the radar is clunky. After 13 patrols I finally figured out how to use it manually and I got pretty excited once I saw that first blip. Still letting the radar op do his job and watching the map for those grey silhouettes works like a charm in thick fog.
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