hmmm, here is an idea maybe. I have some little survival cards made by Brunton that have a removable disk that if placed in a pool of water or a cup of water will float and point North. About as effective as a button compass and as flat as a piece of thin plastic can get, Other than that there is a US military SERE compass if you can find one, they are tiny, work well and when new actually glow in the dark, tritium markers. One model has a lanyard and one has no lanyard hole. I have one from the military days, trit is dead though <img src="/images/graemlins/frown.gif" alt="" />
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No, I am not Bear Grylls, but I stayed at a Holiday Inn Express last night and Bear was there too!