I believe water got into the ball socket in which the compass sits. A couple of tarps which wrapped the boat got released by the winds. Or I was out winter paddling and water froze on the trip home.
I believe the ice cracked the plexiglass globe of the compass such that a fine leak developed.
I guess one must be careful to drain the water from the ball socket after use in freezing conditions or do a better job of sealing up the compass to hull gap…what you see is how it came from the original owner.
Putting a drain hole in the socket doesnt make sense.