There ARE known bugs with the radar. Even with it installed and working it will only show contacts while your sub is facing north and not south. There is a fix for this in the Mods section where some clever guys found all the radars were set to only scan in one heading direction apparently thinking they were making it scan in only one compass direction.
Also, it appears early in the war the radar displays and switches are disabled since patch 1.1 although the radars work in that contacts show up on the map and crew report them.
-Pv-
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