Your Phantom will zip along at 16 metres per second (36 mph) in P-GPS mode if you disable obstacle avoidance.
Same here, like ianzone I am often over water in sport mode witch has gps but no obstacle avoidance, and like Meta said there are very few things to hit. Over waves my VPS has no bad effects only over smooth running water like a creek or river, the rolling and crashing of the waves doe's not leave any stable image for VPS to lock on. One thing to watch out for is that if you are very low and close to the surface and accelerate hard the craft tends to drop a bit in altitude as you accelerate to cruising speed and you could possibly make a water landing (not good).Hi yip I do lot of fast mucking around in sport mode,,hope I right when say this but I presume as long as you got good gps and not the yellow atti mode (no gps)and being above water in the open should have good gps like you are I don't think you will lose no gps benefits, certainly be more agile in monovering and speed side of it,mine holds position in flight well without losing any altitude at all,,,that's my experience with it,I'd lose mine in the cook straight if it did,I'm always out over water,,mayby do a flight down big park or beach front and see how well it holds , yes take care out there Santa's coming,wonder if he got strobes on,ha,all the best Ian
