The virtual goggles
connect to the cameras receiver
the camera (that little black doohickey above) is about 3/4" x 3/4"
it fits inside a special WTC
which is strapped to the boats hull.
Alternatively, the receiver could be connected (via RCA jacks) to a monitor or some recording device.
You can see a video of the tv camera 'Up-Periscope' system.
Having said all that, the ATC 2K has much better quality video, but only records to a card. It does not transmit to the goggles.
ALso look at this Merriman report http://subpirates.com/viewtopic.php?f=32&t=3355