How about a tank tredded metal detector with gps mapping? Could be autonomous unit like a Rumba vacuum you put down on the sand, and it does preprogrammed sweeps of the beaches... A speaker on board could blare out as it finds something, or even a return-to-gps-site feature...
Or, a tow behind sonar with a tether to the boat towing it, to show a map of what's under the water. Cool huh?
More pondering to come...
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