Flying over water isn’t a problem. Launching or landing from a boat is the problem, especially if you don’t understand the logic. Even the simple Trello, with no GPS and only rudimentary height sensors, knows when it is dropped if the motors are...
I’d be flying the done out far enough to get the vertical (if the drone can alter its camera to portrait orientation do that) framing I want and then fly the drone sideways in a straight line along the beachfront taking overlapping shots. Don’t...
More likely your luck ran out! From the moment the motors are started the logic for the drone is to stay at that three dimensional position. If the boat was swinging at anchor I’ll bet the drone moved away from the direction of swing, suddenly...