All real marine compasses have a lubber's line running fore and aft, aligned with the centerline of the vessel so that the pilot can easily read the exact present course and the reciprocal. SH4 for some reason doesn't have it. There was an early mod to install one, but none of the big mods incorporate it, for some maddingly inexplicable reason.
Ducimus, lurker, WernerSobe, ROW team: get to work!