> he arabic world maps that predate columbus that show part of the american continent and even australia. indeed they exist. astrolab and other navigational tools were a state secret like the other meme flag anon have pointed out. to answer how we got it, its whether an intellectual efforts from scientists from all 4 corners of the world, because in andalusia under moorish rule, such cooperations were encouraged, we had people from all the known world contributing to science and discovery, or my 2nd theory would be that it was a relic from the old world that was deciphered and reverse engineered then used, old world as tartaria and atlantis.  we sailed to nordic barbarian land (scandinavia), all through the middle east qatar was only a forward maritime base that was run from agadir (morocco), the modern qataris look physically like our people in agadir, when one see this he cannot unsee it. even saudi arabia was populated from our own country men, back when it was no mans land, this is translated today with our close affinity with the saudis. all the way to china, as it was part of the silk road.
Morocco