In the other thread starting at post #35 on 10/18/08, user kacem78 suggested an inertial guidance device he was working on. The discussion is technically interesting and goes on for awhile, I expect you'll find it worth reading. Alas, kacem78 last posted there in June 2009 (might be his last post, and shortly before the Navimate announcement) and hasn't been on SB since August 2010.
From the discussion, I believe kacem78 had something working as a prototype. Five years on, I expect that the state of commercially available MEMS devices makes this even more feasible. So you're quite right to suggest it, but I thought I'd connect everyone reading it with the earlier discussion of solving this with inertial guidance.
I read the whole thread where kacem78 said he was designing a device working with the Inertial Navigation concept. This was a stand-alone device mounted in the diver's back or tank that tracked the divers position relative to the starting point, without any transceiver or beacon mounted in the boat.
Since June 22nd 2009 there has been no update and no device was presented.
The idea was pretty clever and seem to be feasible.
Sorry that there was no new.
---------- Post added January 14th, 2014 at 12:40 PM ----------
More on this Inertial Underwater navigation system :
Inertial Navigation for Divers | 85th European Study Group with Industry (ESGI) - UEA 2012
---------- Post added January 14th, 2014 at 03:06 PM ----------
It seems that there is already a kit completely assembled that has also GPS interface from Honeywell : Electronic Dead Reckoning Module | Inertial Navigation System
There is also a video explaining what it does.
The DRM4000L module costs $ 550
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