Go with the smallest compass. Your GPS duplicates most of your compass
functions. I have just the small standard compass on my Parker, and I
carry a small bearing compass in my waterproof box.

True but I still have a habit of following a heading and the eyes
aren't what they used to be. :-) My main concern will be stability - I
hate a compass that swings while underway.

Nice rig, by the way. SeaPro makes some good value boats.

Thanks - we looked at a bunch of brands at the boat show and Sea Pro
seemed to offer more of the features we wanted at the best price. A
test ride was comforting - nice ride in pretty good chop and no spray
- even quartering into the wind (but I'm sure I'll soon find a
combination to get us soaked).