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[DetectorGuy]

About a year and a half ago I was laying in bed thinking about diving... I was always a trinket kind of guy... I thought that an underwater GPS would be the coolest thing since sliced bread... I figured that if a person had some capital, he (or she) could make a waterproof container for a GPS unit, but the signal would not be received through the water, so the same person could run a wire from the unit along your dive flag line to the surface and put the antennae on the flag. Then after the dive a person could map out your path on AutoCad in 3D (using a combination of your depth as vertical axis and GPS location as horizontal axis. Marry  two or three dives on the same 3D model and you would have a neat "spaghetti chart" of the area you have covered.

There are five problems with this whole idea:
1. The GPS would only tell you where the antennae is on the surface and not the actual diver.
2. The depth of the diver would need to couple your dive computer to the GPS unit.
3. This would be tough to market as the overhead would be high on a limited build.
4. The market would be small as most divers would not use this much info.
5. About two months after I had this whole daydream... Someone else put one on the market.

After a strong dose of reality, I gave up on these trinkety things, tended to be a sheep, and follow my peers influence. I do like people pushing the envelope on technology and testing these new items so that our sport can evolve from generation to generation. (after all it is still a sport, right?..) If no one pushed the envelope of technology... No nitrox, No tri-mix, No re-breather, No dive computer for that matter.

Just use your head and don't stay up all night dreaming about underwater GPS!