Had some difficulty initially trying to launch from a moving boat. I don't recommend anything but a hand launch because the Phantom will instinctively try to maintain a static point the second it's off the ground (boat) and this inevitably results in a backwards tip over. Trying to fly forwards with the right stick as you lift off is too difficult to gauge forward speed. The only thing that worked for me was the hand launch which I have practised on land first. Controller in left hand with thumb on left stick (UP). Phantom held by leg in right hand above head. Left stick fully up, deep breath, release the phantom. Be ready for the immediate backwards movement of the Phantom in relation to the moving boat!!!!! Obviously the slower the boat is moving the easier the take off!
DJI09064 - YouTube
DJI09064 - YouTube