When I was a TAO on a deployed aircraft carrier, we brought abord some captured Muslim terrorists. They were transferred to the ship's brig for holding.
Each day the brig would call up to Combat and ask where East was relative to the ship so the Muslim terrorists could pray toward Mecca.
Without fail I always answered "One Eight Zero". Due aft of the ship.
I never looked at the shipxs heading or determined where East was.
I just knew, that in the ship's brig, the head was aft of the holding cells.
So every day, I had the Muslim terrorists praying to the toilet.