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This device should be able to tell you where you are to the nearest degree. Not as accurate as a proper sextant, but it's a lot less work to stick in your luggage when you go somewhere, just in case you end up on a deserted island and need to find your way home. You use it by holding it vertically so that the keychain ring hangs down, looking along the edge of the protractor at some reference point in the sky, then checking the angle made by the string and subtracting 90 from it. That gives you the height of the reference point in degrees, just like a sextant, so with this and a reasonably accurate clock you can tell where in the world you are with enough precision to make it back to the nearest continent or large island. Anyone else made any interesting devices out of common items?
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