I bought one and installed it on my sailboat and was unhappy with the results because the camera leaned with the boat. I then made a home-made "gimbal" to hang the camera off the bow rail and it gave an entirely different perspective. I haven't taken a picture of the gimbal, but here is a video with the camera able to remain mostly horizontal during the sail:
It's a little more shaky, but I think it provides a more realistic representation of the experience.
Fair winds and blue skies,