Photos don't do this justice, but details help give a sense. Found in Maine, it reminds me a bit of folk art clocks used to teach time, but this one made of brass and showing a rose compass, detailed down to 10 degree increments, with type pressed directions down to the eight half winds (NNE, ENE, etc.) Certainly navigation related, though whether used for teaching navigation or actually navigating, I am not sure! A beautiful thing whatever the case, with the dial rotating smoothly all the way around, and etched lines radiating from the center. And two holes at the corner for hanging.
7 1/2" X 7 1/2", gorgeous untouched patina to the brass, wonderful antique condition.