From which they managed to deduct that the Earth is round (Centuries before Mediterranean Empires sneaked out a mere 250 nautical miles into the Atlantic) while positioning Venus and Polaris as evaluation for distances. Crab Nebula & Andromeda included, btw. The astronomical data (and correspondence with) transmitted to the Mayas is simply mind-boggling. Not only that, the "Fleets" were designed (and relayed) to provide weeks of supply at HighSeas. Modern Borneo and the Philippines have ethnic traces matched only by Australian Aboriginals... and that's not talking about Japan Kanji or their specific architectural designs. Sails, who needs Sails -- it's not the Wind, it's the exact Location listed on precision maps that would put Mercator to shame for lack of accurate details. Yep, Catamaran and rafts.