Thank you. The cone shaped hills are known as 'the 5 sisters'. They are shale bings. I was going to fly around them today but didn't have enough battery left so I'll get back to them soon.
Interesting, good flying too. What I’m also really interested in are those cone-shaped hills at the 0:55 mark. Can you do a movie of flying over and around those? They look fascinating!
I don't think that is always the case, but it can be a requirement for a specific agency. The Federal requirements are defined by NIST SP 800-88, and one option is to overwrite the data to eliminate recovery. That allows the media to be reused.