Honestly I have no idea but there is a legal limit of 120m high. I don’t think I have got to half that.
The thing is designed to fly back to its “home” if it loses the signal (or the battery gets very low). Home is usually where it took off from but you can change that in flight if you are on the move
There are rules but to be honest I think most are ignored or unenforceable, for example you are not supposed to fly above people, you are supposed to keep it within sight, not fly at night. The only rule I have disobeyed is the keeping it in sight rule Once it is over about 30 m high I can’t see it anyway even if I know where to look, they are very tiny.
If there is a plane or helicopter in the area you are supposed to bring the drome home and land.
My youngest son has flown his drone a few km away from him using a signal reflector. I am just learning how to plan routes so you can program the drone to fly a certain way and look in a certain direction. You can tell it to complete the route even if it loses signal and only return home after it has done that.
Yes, that makes sense.
Living very close to Gatwick Airport there have been quite serious issues with drones in the past.
Also going back some there was a bit of a thing for those homemade rocket kits with solid fuel propellents, some of which were quite hefty, surface to air missiles!
However I tested the return to home feature several times today and it landed automatically on the board not exactly dead centre but close enough. In fact the only time it missed was when I landed it manually.
The GPS built in is remarkably accurate within a few centimetres
Shellharbour Airport is near me (it is uncontrolled) but there is now a passenger plane that flies out daily to Brisbane and another to Melbourne. Since those flights started my controller warns me that I have restrictions imposed on my drone. Actually nothing that seems to make any difference as far as I can see but the warning is there when I take off