When I first bought and used my DJI phantom, I would receive a blinking and loud beep from my remote when the battery was low. Now that I have introduced a black Pearl FPV system it doesn't warn me when the battery is low. Did I just accidentally mess something up with the settings? I am also flying in Naza M, would this effect it? The reason I ask is because I plan on flying over water, and I want to be able to tell when it is time for me to bring it back home without having to guess. The last thing I want is it flying back on its own b/c it never lands exactly where it took off.