Wow, maybe I can offer some value to this particular forum. I literally wrote the book on HDV, and can comment on the HC3...It's going to (most likely) give you issues due to the way the electronic stabilizer works in this camera. Even tho it's a higher cost, the A1U is being used very successfully as a helmet cam. The HC3 has a different stabilization system, and coupled with the MPEG format, likely will macroblock. Force the shutter to lock at 1/60, and let the rest be auto, and you'll be getting the best this cam can give. I have an HC3, A1U, Z1, etc, but I'm a newbie to the sport. I've edited and processed/corrected a LOT of jump footage, which has inspired me to start jumping myself, but that doesn't qualify me to talk about the cam as a helmet cam. I'm happy to answer any HDV questions, HD questions, etc that you might have. I don't know much about jumping yet, but I know video backwards and forwards.
