http://vocuspr.vocus.com/VocusPr30/Publish/100042/Forward_100042_1135631.htm

Diver Navigation
04/13/2006
Special Operations Technology

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With the Mk 107 Mod 0 Hydrographic Mapping Unit (HMU), the U.S. Navy SEALS now have a standalone navigation aid for clandestine hydrographic reconnaissance, mine countermeasures and ship-attack missions. Used in place of the familiar combat swimmers tactical board, the handheld device integrates complementary sensors to navigate underwater accurately, map the sea floor, spot obstructions and record images of underwater objects. The state-of-the-art HMU was designed and integrated by the Applied Research Laboratories of the University of Texas at Austin and built by Teledyne RD Instruments in San Diego. Though production deliveries to the Navy concluded in September, Teledyne RDI continues development of a commercial Map-Tac navigator with some of the same autonomous navigation capabilities for other users.

* Complete article at the link above...

Also...

http://www.rdinstruments.com/nav_main.html

www.dvlnav.com