I have just added this to the map of places to fly your drone at Drone Scene:
Land owner permission requirements unknown.
Take the Ness Battery road from Stromness and park up at the free car park, the ferry comes in 2 to 4 times a day - depending on season and demand and passes through Hoy Sound at about 1000ft offshore - your spotter needs to have good eyesight to stay within the Drone Code.
The foreshore is an SSI, but the road is clear, and as long as you dont interfere with the flora then you should be ok to fly. Watch the wind direction and speed, we had 18mph blowing onshore, so N mode on the MINI3 Pro worked well for us.
The originator declared that this location was not inside a Flight Restriction Zone at the time of being flown on 26/06/2023. It remains the responsibility of any pilot to check for any changes before flying at the same location.