It always struck me that Seamanship did not retire during the era of the Roman Empire. After all, Caesar himself encountered superior shipping operating in the Bay of Biscay quite able to sail across the Atlantic.
And whereas we now live in a world in which adventurers have made that exact trip often in small yachts, it was hardly daunting. Where it failed then was simply that there was nothing much to go for except salted cod off the Grand Banks . That enterprise was clearly established at the time of Columbus ( John Cabot 1497 ) and surely had been operating well back into Roman times when a market had been created.
Thus the presence of ac roman shipwreck is generally good news and allows all these ideas to be advanced.
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