Compasses, I love 'em. I carry an orienteering type in my pocket. On board in addition to the two binnacle and one compass for the autopilot
I have a hand held with a pistol grip. I don't know the make but I find it great for taking bearings. The grip makes sightings easy.
New Zealander David Lewis reports that polynesian mariners in times before magnetic compasses would navigate by testicals. Even when the sea was confused they were able to determine the direction of the swell and by knowing prevailing swell directions could navigate by that. The testicals are sensitive to swell when properly trained and employed.
This tidbit is brought to you via a marvelous book "Passage to Juneau" by Jonathon Rabin.