This is my first posting here. My handle is the first hobie we had and raced at every possible Florida race. My dad's friend's son was my crew to get us up to 150lbs. The last hobie i owned in the lower 48 was hobie 18#600 which i normally sailed with a 180lb pound crew. We always beat up on the nacras in Nor Cal back in those days. and the rest of the H18s for that matter. Then during the 80s i sailed OPB (other people's boats) or at the Hobie nationals/ worlds you would sail supplied boats. I don't know what the sail number of the H18 that i have now is because it didn't come with a sail, but it's a 1991 SX without the wings. It has a set of old Tornado sails on it now.
Anyway there is a camera called an atc-9k that has an optional gps module and it's own software to display your video in one window while other displays are shown in other tiled windows on the screen. So it connects to google earth and gives that image as one of the tiles. There is also a tile for speed with a graph. This is a different approach than the OP, so not sure if it's all that relevant.
if you skip ahead to 1:31 in this video you can see an example. I did a quicktime screen recording of the ATC software in action and put the clip in my little video. http://vimeo.com/70732729
It isn't shot from a hobiecat. i hope that's ok. I am a composite board builder these days and made an SUP sized cat because they won't let me launch the 18 at the beach that i like to sail from, but they do let people carry in SUP and kayaks.
It's a fact that video shot from a tender or from shore is much more useful, and more interesting, but onboard video has some use and is way better than no video at all for learning purposes.
The ATC gave me many problems, but they sent me a new one twice. Now i am careful to mount it where it doesn't get bumped and i double check the snap that makes the seal for the case. Also it's better to turn it on at sea because the gps can't seem to connect at the beach launch spot. If it isn't connected when the camera first starts shooting, no gps data records for the first 20 min. increment. The camera saves the shoot into 20 minute video files, so the gps kicks in on the second file sometimes for me. You would have to search out this camera, because it's discontinued. -i think because it is a little delicate- . There are newer models from oregon scientific, but i have not checked them out.