Thanks, that looks like it. Surfaced "draught" (draft in Yankee Doodlish) shows 5.61, which works out to about 16 feet in real money. In real life a fleet boat blew with compressed air and came up to a keel depth of about 20 feet or so, then ran a low pressure blower which took 15-30 minutes to empty the tanks so she was riding in surface trim. What I'm trying to avoid is the rough seas problem repeatedly shutting off the radar, and for some reason the Sargo draws 17 feet most of the time and wants to hover between 19 and 21 feet when it gets moody. That time of the month maybe.
Other possibility is "submerged" draught under the surfaced, that shows 7.5 which is about 24.6 feet. Could that be the value which decides when the bridge crew disappears? If the programmers were lazy (pardon me, but many things about this game point to that possibility

) they might have set everything to be keyed off that single datablock including diesel cutoff and radar shutting down.
I'll fiddle with that and report back.