I have just added this to the map of places to fly your drone at Drone Scene:
Land owner permission requirements unknown.
Ancient chapel on the Essex coast among earlier Roman remains. Thames barges sunk just offshore to protect the coastline . Parking nearby.
The originator declared that this location was not inside a Flight Restriction Zone at the time of being flown on 12/10/2022. It remains the responsibility of any pilot to check for any changes before flying at the same location.
