kayakdiver
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I'm the author of the deploy and recover method mentioned above...the msn group no longer exists...check out the video on Youtube by searching, "underwater gps". It shows a new adaptation of the original method.
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Well... I'm no military expert, but wouldn't something like that be top secret? If there was one?
What is possible is for someone to make a gps-specific housing that has a port for an external antena, kinda like the ports for external flashes on the high end camera housings. The antena can then be a "floating wire" or just run up to the dive flag in tow. Maybe integrate it into a reel... But what do I know.