It's possible to any country in the world over any sea, so howcome the so called 'Edge' hasn't been found yet? And how is the curvature of the earth, as seen, filmed, and photographed by pilots explained? Lastly, how do you explain why pilots have to reguarly tip the nose of the aircraft when on long haul flights? And it's NOT because the aircraft is constantly rising.
Interested in the explanations.