Distance-ship-subsystem
From FreeSpace Wiki
distance-ship-subsystem Distance from ship subsystem (Status operator) Returns the distance between an object and a ship subsystem. The object can be either a ship, a wing, or a waypoint. Returns a numeric value. Takes 3 arguments... 1: The name of the object. 2: The name of the ship which houses the subsystem. 3: The name of the subsystem.
Comments
One use for this SEXP is carrier landings, can be done by checking the distance to a fighterbay subsystem and then using end-mission to dump the mission to debriefing once the player is close enough.