[HALtheWise]

Yes, it works just fine over water. If you are going to use it for surfing, I would recommend taking a beacon in a waterproof bag of some sort, just to have the extra range and make sure it doesn't lose you. Keep in mind that the warranty does not apply to water damage, so fly at your own risk.

Also, make sure you can get back to land when the battery runs out, or that you're really comfortable hand-catching it.

Edit: I have been informed that you can manually set a "home point" on land to return to when the battery gets low. Also, apparently the surfing footage we captured was done with a pilot on shore with the joysticks as a range extender, and the subject being tracked purely visually (no beacon involved)