I was going to take some video of some people canoeing on a fast moving creek. But instead of my P4 just hoovering over the creek it started to move with it. I wasn't very high and am just wondering if the vision system may be locking on the churning water and instead of staying stationary it tried to compensate because of the moving water underneath it acted almost like I was in att mode. The drifting went away when I went higher up. Filming above the creek is something I will be doing is there a way that I can get it to hold steady say 10 to 15 feet above the flowing water.