The rise of the ramp is the vertical dimension and the horizontal projection or run of the ramp is the horizontal dimension. If the slope of a ramp is between 1:12 and 1:16, the maximum rise shall be 30 inches (760 mm) and the maximum horizontal run shall be 30 feet (9 m).
GoPro, Inc. (formerly Woodman Labs, Inc), is an American manufacturer of action cameras, often used in extreme-action videography.
But even with the closed door during surfing, the sound was fine. A benefit of the closed housing door is that wind noise is nil. The GoPro Hero is my favorite sports cam. Cheap, impossibly rugged, with endless mounts for cars, bikes, helmets, chests, surf and snowboards.