Underwing registration
I just wanted to get opinions of the height something like a C172 / PA28 would be for the underwing reg to be clearly read by the naked eye .
The reason I ask is On Sunday afternoon an aircraft (2 to 4 seat single engine) circled the village I live in a few miles south of Northampton around a dozen times annoying the neighbours with the noise. I wasn't there at the time so didn't witness it and find it a bit odd that they would purposely overfly that many times. The under wing registration was clearly seen with the naked eye by someone with slightly less than average sight (albeit written down incorrectly, so no calls to the CAA).