Map contacts on or off? IIRC (unlikely at my age) there's no map icon with contacts off.
Another gripe last night, hacked the zones.cfg long ago to get rid of the silly "bang you're dead" arcade game programming. Rudder destroyed can't turn so game over, propellers destroyed can't move so game over. So changed the "UPropellersXXI" (U-Boat type 21, rather than changing the code from SH3 or writing new code they just used that for the fleet boats) and "RudderXXI" to armor level 250 and 1500 hit points so they can't be destroyed with a single depth charge.
Last night while running submerged at flank speed fired one fish at a MAYA heavy cruiser, he was alert and dodged it so I fired another at 600 yards which hit a magazine, then dove to 100 feet to try to get under him and he sank on top of me. Down to 400+ feet by the time I got loose, many systems damaged, but that's okay because the bridge lookouts all have high mechanical skills and they all go into damage control while submerged.
They had everything repaired withing 24 hours, 11% hull damage but all systems showing no damage. Except fuel was at 22% and battery at 25% and would not charge. After battery was damaged in the collision but not badly, forward battery no damage at all, and the after battery was 100% repaired - yet no battery charge. Checked the battery charge on/off button and cycled it, still no charge.
Okay, a refit usually repairs stuff that hasn't been repaired, even though the damage control screen was showing everything shipshape, checks 4.0 away we go, so headed off to the sub tender at SPECTRE 42 for a refit. Still 25% battery which won't charge, fuel fills up then promptly leaks out to 22% after multiple refits.
So the game don't even model emergency repairs alongside a sub tender which is specifically designed for that task. Almost makes you want to go back to PacMan.