Useful. I was thinking some sort of additional "sensor" that we'd make up sepcifically for the task. We can set the range to X meters, that doesn't matter as long as it's realistic. I don;t want to always get spotted, it'd be nice to worry about it, though.
I do know that from rereading Blair, it seems to have happened fairly often.
Water clarity/depth might have something to do with it as well. In shallows, the sub might stand out vs light sandy bottom in clear pacific water. I was on Kauai a month ago, and you could read a newpaper at the bottom if you dropped it off the boat.
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