Is 2Gb enough for all day of sailing? Do you turn it on and off to save memory? I've only seen the finished products with music and all. I assumed that to get a decent 3 minute video, you would have to have at least 30 minutes of live action to work with. I'd really like to get some kind of a water resistant camera setup. I really like the price of the Hero3. Does anyone know of anything else out there that is even more "likeable"?