Took the 550 out to test the distance of my FPV system. My 550 rig has the iOSD mini, and while flying for distance yesterday a 'FS / Go Home' message appeared when I reached the 800 meter distance. I quickly turned the craft around and headed for home. I had about a 10 mph headwind so it wasn't difficult for me to get back (I did this intentionally). Anyhow, I'm a relative noob to this hobby, but I don't recall in any of my research about this particular thing happening. When I landed I had about 35% battery left so I doubt it had anything to do with the battery. Hopefully someone here can offer up an explanation. The limits that are set up in the Naza F/S tab are the default (2000m altitude, 2000m radius). Thanks in advance for any help.