Underwater GPS-based navigation for divers
Who says you can't use GPS underwater? NavDive is a GPS-based system that gives a diver the same type of tools available for surface-based marine navigation.
How it works
NavDive is a patent-pending system that consists of two main components -- a surface based GPS receiver/transmitter that acquires a GPS fix and transmits it to the diver. The other component is a portable diver-based receiver/display unit that receives the GPS information from the surface and allows the diver to operate underwater.
The system also includes a desktop application to review the GPS data saved. You can also view all position and tracking data on Google Earth.