"I too thought of piggybacking some data on the video, as who needs yet another transmitter draining the batteries? To start I built a close-caption decoder from here: http://www.brouhaha.com/~eric/pic/caption/, and tested it with a normal video…"
"Some amateur radio folks put together a DGPS reference station a while back. Used Motorola Oncore GPS, which the UT+ model supported "site survey" mode. A survey took about 3 hours but then you had your own reference.
You can find the HW docs here:…"