Ignore my previous post!!
SEA.BMP is using CLEAR.PAL, CLOUDY.PAL, OVERCAST.PAL, NIGHT.PAL and STORM.PAL. Those palettes are what gives the ocean different shades according to weather of course, and day / night light.
SCOPE.PAL is for SCOPE.SCR. I am not yet sure about BRIDGE.PAL, but I suspect it maybe one time had something to do with BRIDGE.SCR, which seems to me to be the beta conning tower screen. It is not in use however, and will not look right with any palette I have tested so far. I am sure I have seen this bridge screen before, perhaps in some magazine preview..