Mirror Compasses Sight Objects and Watch Compass Needle at the Same Time Improve your ability to take precise readings with mirror compasses from Ben Meadows. Flip-up mirror lets you simultaneously see your bearing and sight on a distant landmark. Tool-less adjustments let you "set and forget" the declination and get on with the work at hand. And the mirror can double as an emergency signaling device! Find your correct bearing with mirror compasses from GFS.