These button compasses are about the only ones I've found that are reasonably reliable. I finally came up with a cheap, easy, durable way to add one to a watch band. I'll
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Vimal Nautical Brown Antique Brass & Lather Wrist Watch Sundial Compass Wrist Sundial Stempunk Watch 3 Inch Approx : Amazon.co.uk: Home & Kitchen
Glow-in-the-Dark Clip Compass – Marathon Watch Europe and UK