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kroorda-
We are well aware of the GPS limitations underwater, which is why GPS doesn't exist there. Thank your friend for his input on pingers and ultrasonics; nature is a beautiful thing and often provides the most elegant solution to man's problems (dolphins and bats navigate/communicate the same way). The technical aspects aren't really the problem as we think we've come up with a cool way to deal with them. The real problem for us is what does a diver REALLY need? What I mean by that is simple: if you bound the problem with a solution and say "I need GPS" you're thinking about the possible solution without analyzing the problem. We're more interested in what is the actual problem that needs to be solved, which is why the questionaire doesn't have any technical questions. How a diver finds cool things under the water has nothing to do with what technology ends up being used, and we're trying to find out what's most important to the community as a whole.
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