Maybe i can clear up some of the confusion here. Albiet i have no idea whats changed in GWX, nor what version their up to. But last i was into SH3/GWX, In terms of visual detection: either your watch crew, or the AI theres 3 things at work here:
1.) "Vampire night vision fix". Its a adjustment in the visual->sensors.dat that restricts some of the parameters to where it accentuates the effects of weather. You really have to have a good solid Line of sight. In a rolling sea, this is why your spammed with "Ship spotted" over and over again. As LOS shifts, the watch crew re-reports it as a new contact. This is also in part, the reason why your crew often enough can't spot something 5,000 meters away, while to you the player, the ship is as plain as day. This is particuarlly true in dawn/dusk, and nightime scenarios.
2.) By default the AI_Visual is 30KM max distance. I beleive this is part of the reason why most of the the GWX singleplayer missions start submerged, im not sure if this was neccessitated by design or to fix a side effect of the wave atten settings (see below)
3.) Wave attun settings in the sim.cfg. These settings GREATLY accentuates the effects of weather to put it mildly. What you'll find is that clear calm conditiions, you'll occasionaly find yourself being shelled by a warship you cannot see (as your max visual range is 16KM, theres is 30KM), on the otherhand the weather has an equal and opposite effect to your favor in rough seas. So the effects of weather (both pro and con) are extreme, and rough weather greatly increases, or decreases the AI's max visual distance.
Now all that said, normal detection routines still apply, and how to deal with that aspect is outlined in the AI demystified sticky. IF default GWX AI visual settings are not to your flavor, there are mods out for that, but you'll have to search the SH3 modding forum to find them. The easiest solution is just play smart (see AI dymistifed thread), and dont loiter on the surface in calm weather.
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