Re: OK, so which part do I register?
The 400 foot ceiling refers to an "above sea level" limit (this is already in the Drone Code rules). Technically you're not allowed to fly a drone from your 800ft cliff because you're already above the limit. It's supposedly to avoid interfering with manned aircraft, but it's hard to see a manned aircraft wanting to get that close to an 800ft cliff...
Biting the hand that feeds IT
