I was flying in my heavily wooded back yard and had the prop guards on. I was surprised when it stopped and gave me a warning that I had reached maximum distance at about 325'. I tried it several times with the same result. I went out in the open and again confirmed the limit and then removed the prop guards. I flew out to 1000' with no sign of the limit. I can't find that in the manual but I guess it is active with a payload.