According to DJI and other threads on the issue, DJI drones use CE regulations for signal strength in the UK. Apparently, the drone uses its GPS location to determine which regulatory agency to fly under.
DJI specs the 3S at 8 km under CE regs. FCC specs are 15 km. So that's quite a range hit for the UK and EU and other countries. And those are ideal conditions that would be hard to match in the real world.
As long as you are still receiving the FPV on your screen and in full control of the drone, why would the distance away cause any butt clenching? The only real anxiety that ever occurs is from loss of signal, and even then, only when it continues for more than a minute, as even at the limits of the control signal, the lost signal RTH will quickly restore signal once the drone is back within signal range, in well less than a minute.
Got it! Range anxiety! However, using a realistic Mavic 3 Pro flight time of 30 minutes on a 100% battery, at 30mph in Normal mode, that's 15mph round trip, or 24km total, so 12km is the realistic out-leg that will still make it back. So, at 8 km away, when you turn around because of the CE signal limit, you'll still have 66% battery left to cover any unexpected headwind for the return flight, and will likely still land with more than 30% remaining battery. No need for range anxiety at 8km away under CE limits.
