Personnally i rebound it to numpad 5 so i can't possibly hit it by accident, i know numpad keys are the same regardless of special keyboard layout, but the problem that comes with this is that some keyboard to do not have a numpad (some notebooks and etc..) so it wouldn't probably be the best "generic" choice.
Maybe a CTRL+\ instead of a simple \ would prevent any possible accidental use, without forcing the user to rebind the key ?
But then, on some OS CTRL+\ could lead into something unexpected, i'm not sure
Maybe a F-something key like F12 as for now they do not seem used (out of F1 i mean), but maybe you have some plans for later with them
edit :
completed a relatively calm 2 missions patrol that took a a bit more than a month at sea
Mission log of Soviet submarine Kola.
Day 1, 05:50: Patrol started in Leningrad, USSR.
Day 1, 19:35: Turbine generator malfunction.
Day 6, 06:23: Malfunction occured in Primary Coolant Pipes of No. 1 Reactor.
Day 10, 14:45: Malfunction in No. 2 Turbine.
Day 10, 21:21: Control Rods failure in No. 2 Reactor.
Day 12, 19:41: Fire suppression system malfunction in command centre.
Day 16, 08:45: Kola performed reconnaissance of Barcelona port facilities.
Day 19, 17:19: Ship sunk: MV Ehrensköld (Swedish Oil Tanker).
Day 22, 03:10: Ship sunk: HMS Severn (British County Class Destroyer).
Day 25, 17:01: Ship sunk: SS Mecklenburg (West German Oil Tanker).
Day 26, 00:18: Turbine generator malfunction.
Day 26, 00:34: Ship sunk: SS Erfurt (West German Large Cargo Ship).
Day 26, 00:34: Kola successfully engaged enemy shipping near 65 N 9 E.
Day 26, 00:40: Malfunction in No. 2 Turbine.
Day 26, 03:00: Ship sunk: SS Ashigara (Japanese Oil Tanker).
Day 26, 12:55: Ship sunk: INS Spear (Israeli Sa'ar 4 Class Missile Boat).
Day 30, 23:37: Kola docked at Murmansk, USSR for refit.
Day 34, 23:37: Kola departed Murmansk.
Day 34, 23:41: Patrol ended at Murmansk, USSR.
The sonar and identification are really good addition.
Didn't met any enemy sub so far.