I have too. In addition I'm a professional mariner and have crossed oceans in commercial vessels. All you did was go around a table top rather than around a sphere. This is how circumnavigation actually works. The north pole is the center of our known earth, and Antarctica is an encircling landmass. What lies beyond Antarctica, I can't say for a fact. Why do you think millions per year circumnavigate east/west but no one has ever circumnavigate north/south? You can't fly over Antarctica and pop up on the other side of the world.