Captain Dashboard, call your office!
I have seen those types of compasses. Several years ago, bought a bell that had a built in compass. The steel in the steerer tube, steel screws in stem, steel star nut, steel stem cap bolt all threw it off too much to be useable.
Plus, want one that I can carry while walking during sightseeing. That trip where my compass in my watch did not work, I had an old GPS and walking in the old part of Prague where roads were narrow between the buildings, my GPS had trouble picking up satellites because of the tall buildings and limited unobstructed sky. Wished I had a compass in my pocket that day, kept getting lost in the narrow streets.