For quite some time I'm playing SH3 "Aces of the Deep"-stylish:
I reduced the opportunity contacts range in the contacts.cfg to 16km which is my visual range (playing the 16km atmosphere mod obviously) and I think this is more realistic because unless it was a very important ships there were no radio reports of loners somewhere in the ocean (who would have gathered that info anyway?)
I'm very pleased with it and get only a bit fewer contacts because I dive now regularly to do a sound check and get to find ships which are way out of my visual range this way.
So I'm interested in your opinions about this.