You don't need to be an 'investor' to invest in Singletrack: 6 days left: 95% of target - Find out more
Just had a look on ADS-B Exchange flight Tracking site and there is something doing a lot of flying above Edinburgh Zoo.
Somebody got a new drone or have they strapped a tracker to a bird (fly 28kts at 62000 ft Apparently)?

Is it flying ants day yet?
That will explain the 'mess' on my car.
That will explain the ‘mess’ on my car.
Ditto. I thought my car had been milkshaked by the local kids but no, it was liquid guano...
Thread here says: It is a calibration transponder, it will be on a local tower. Used by them to calibrate the WAN MLAT system the airport uses. The usually have them reporting at ridiculous heights or even at underground negative figures so they don’t get mistaken for anything.
https://discussions.flightaware.com/t/strange-transponder-showing-up/75477
Giant Panda rescue party.
Seems to be a test transponder for calibration purposes.
Thanks, was puzzled as I have never seen anything like that before.
(Can you tell I'm bored (WFH)).