Another possible violation: if the drone is flying after sunset and has no anti-collision lighting which is visible for three miles, that is a violation. Report that to the FAA.
One more tactic you might consider; take a drone and go photograph...
Here's the actual rule regarding minimum safe altitudes for planes.
§ 91.119 Minimum safe altitudes: General.
Except when necessary for takeoff or landing, no person may operate an aircraft below the following altitudes:
(a) Anywhere. An...
Lake Vyrnwy is a large man-made reservoir in the Berwyn Mountains of Wales, created in the 19th century to supply water to Liverpool. It's a popular spot for nature lovers and outdoor enthusiasts, offering activities like walking, cycling...