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