I picked up a hero 3 black edition early this summer, Awesome camera! nice clear pictures and video. I run my videos 48fps w/ wide angle for out on the boat, snowboarding and biking.. I made the mistake of using the wide angle while on couple hunting trips makes the deer/ elk look like its 100 yards away when it was only about 30-40yrds. Narrow view works best for that.
Get yourself a couple spare batteries and make sure on the first charge that they are fully charged before you take them off the charger, mine took couple hrs before they were done. They usually last a few hrs before I have to swap one out.
I found the gopro batteries last longer than the wasabi batteries but its not by much. heres a link for 2 wasabi batts with charge
http://www.amazon.com/Wasabi-Power-...qid=1388457843&sr=8-1&keywords=wasabi+charger
I got the battery backpack for mine, plan on try to do some time lapse footage soon.
Also I use the 64gb chip and have a 32gb for backup
One important thing you should get is the floaty back door, so you don't have to watch $400+ sink beside the boat lol.
The only way to view what your shooting is with the LCD backpack screen usually find those for around $70, theres also a touch screen one id recommend going with that one a lot less hassle. When your using the wide angle with video you don't have to worry as much about how accurate your pointing the camera you would be surprised how wide of an angle it shoots
For mounts I use the jaw flex clamp, chest mount and pole mount for on the boat and underwater shots (ski pole works great for that)
The clip on polarized lens works great for out on the water, huge difference from the glare without using it.
If your brave enough to hook it up to your rigger, which I haven't done yet, ill save that for the summer when im fishing shallow. The red filter should be used when your filming down deep anything over 20-30ft makes a big difference in clarity and colours.
Hope that helps to get you started pescador.
Heres a couple videos I took this summer/fall diving, make sure you watch them in 1080p for the clearest picture.
Might take a sec for it to load into HD
[j8UrKXVjNsM] http://www.youtube.com/watch?v=j8UrKXVjNsM