Enough people have been emailing me asking how I mount the GoPro camera on the clew of my windsurfing boom that think I should post a formal explanation / tutorial. I copied the technique from Andy McKinney of Lost In Hatteras fame, and the picture I am posting here is his, too.
The Andy McKinney boom mount
Basically, you take the helmet vent strap that comes with the GoPro helmet hero camera, and lash it tightly to the underside of the clew of your boom. That means the camera will be upside down when you clip it on, but you can flip the video when you process it in iMovie or whatever other program you use to edit the video. (No one wants to see a long, boring, unedited video, anyway.)
Tying a safety leash onto the camera and / or having a big, colorful float on the camera is also a good idea in case the clip breaks or the strap comes loose. Also, depending on the geometry of the clew, sometimes the camera will be most stable with the base of the vent strap not directly under the clew, but about 45 degrees across the back of the clew, stabilized agains the ridges where the pulleys are in the clew. It takes some trial and error to find the perfect angle for the camera to get the board in the shot and not cut off your head, but you'll figure it out. Happy filming!
PS- Here's links to some of the posts where I use this boom mount:
Note: in this last one I actually did the camera on top of the clew, with a few extra hinge joints to get it up at the correct angle, but that was less stable and only worked because the water was super flat.