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Another question for all you electrical engineers out there.. On the website that is listed in the sources section on the psubs page, there is a company that makes a small gyroscope..It seems to me that this would be relatively simple to make some kind of a direction indicator, similar to the gyro-compasses on airplanes..This paticular gyroscope only measures rate of turn, but I am sure some fairly simple electronic wizardry could be incorperated to have it indicate a direction, when you set it to a known direction on the surface..This might be done by putting it inside a electronic compass perhaps.. I called the company, and they offer the gyroscope for $150.00 (US) very reasonable. This might be a inexpensive solution for a gyro compass.. (aircraft ones are air operated generally, and the electric ones are expensive, although if you might be able to find a reasonable one at a aircraft wrecker place or something..)