You would be 10,860 above sea level but not above ground level (AGL). Now 9K AGL is something. requires software hack to be almost 2 miles AGLFunny, I could be at 10,860 feet 30 minutes from my house, and much higher once I launch. Just might get your video of a drone at 9000 feet yet! Ye gads, I could do this, and still remain below 400'!