This digital compass may be the closest to possibly working for cave survey that I have seen. LINK
Says it's waterproof, accurate to +-.5 degrees. Pretty costly: ~$300, but for big projects where accuracy is important, this may work. Anyone seen/tried one?
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Cavechat is the official caving forum of the National Speleological Society.
The NSS is not responsible for the opinions expressed, and cannot verify the accuracy of information presented.