Map updates ON but with the Map update mod, which makes it so that no contacts appear on the map except at very low zoom levels, making it impossible to use the plots accurately. That essentially means I have map updates OFF.
The reason I use this setup is that it preserves the sonar bearing lines, which I consider a given (IRL the sonar guy should be there to tell you the bearings of the sound contacts). Found it the right balance for my sim needs.
All other realism settings on, except stabilised view (the up and down drives me nuts!!
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