Tonguez
A suffusion of yellow
Imperialus said:By 1450 ships had evolved into real ocean going vessles. I mean 50 years later Columbus crossed the Atlantic and came back safely. As had already been mentioned the sextant and compass allowed ships to safely leave site of land and rigging had advanced to the point where oars or sweeps were only used when trying to navigate a confined area such as a harbor.
Of course the western Pacific Islands (and by implication the islands of SE Asia where the inhabitants origanted) was populated by 3000BC with people who used catamaran technology and advanced navigation techniques to explore the Pacific ocean far from site of land and travelling upwind (which was logically safer although more difficult) to not only discover and settle a many scattered islands of the pacific but also to reach South America (probably 1000 years ago). The Tongan Vaka-tele (ocean going double hulls) were said to be big enough to carry two large canoes or 500 men and they were intimately aware of their environment and the weather patterns which allowed them to travel across the huge distances of open water.
I suspect the original question relates to European maritime history but in a general fantasy world their is no reason why the catamaran rather than the huge clunky monohulls of Europe can't be standard. Afterall the SE Asian ('Austronsian') ancestors of the Pacific peoples were out exploring the worlds greatest ocean whilst european craft were hugging the shorelines...