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A company that manufactures magnetic anomaly detectors hires me periodically to provide a boat to test out their instruments on the SF Bay. We stream a stereoscopic MAD out behind the boat a few hundred meters and start "mowing the lawn" as it is called. We have had numerous hits and I have always been curious to know what it detected. I will never know of course but it sure has my imagination going sometimes as to what it might be.
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David
Where land ends life begins.
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