Those are "node" designations used in the DAT file for a vessel, whether ship, air, sub, etc. The letter "M" can be thought of as "Main", as in main armament, followed by a number designation for the gun position. The "S" would be "Secondary", the "A" for Anti-aircraft. There are other designations for other "equipment" used by an "asset". I don't know why, but all this makes me hungry for lunch...
@ Bubblehead1980: I still haven't found the thread / post I was referring to earlier about someone having changed their AI guns to being able to target vessels...
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