I started off with my boat's original 40 year old flush mounted compass
. I stepped on it, coming down from the forward deck
and broke the globe. It was yellow, old and brittle and scratched up, so no surprise, and no bother.
I replaced it with a decent Silva from the local chandlery
. I observed that it really seems to be about 30 degrees off. Before I could start messing with the correction screws, one of my inexperienced buddies came down from the deck
, stepping on it and broke the mounting ears.
I have purchased yet another compass
, and just placing it in position for a test-fit it too, appears to be about the same 30 degrees off.
The only thing I can come up with is that I recently made a winch
handle for my halyard winch
out of 12" of 1/8" thick flat, steel
stock. It is stowed in the winch handle pocket about 1' from the compass.
Is that amount of steel
enough to drag the compass off that far, or do I have other problems?
What is the better fix- Calibrate the compass against a GPS
or relocate the winch handle stowage? (I hate drilling new holes)