The mounted kayak compass I was considering has been discontinued and replaced with these from the same company.

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More or less the same except it is a bit trimmer and has better styling. Plus it is black instead of white and will match my boat better. ::) I'll give it a go and let you know how I like it. I might have to do some machining and make an adapter plate so it rides primarily in the cockpit area instead of overhanging into the cargo area where it might get pulled off....bolts or no bolts.