when winterizing my boat, I did not remove the large compass.

recently, i looked at the boat and the compass liquid was empty. i
suspect it froze and cracked a seal and drained out upon thawing(?) i
suppose this liquid is not freeze-proof...

1) should large liquid filled compasses typically be removed prior to
winter or was this probably a freak incident and the liquid should not
freeze?
2) what fluid is typically used in the compass? if water, can i
simply repair by refilling (and sealing) or should I scrap it?


-mark