The Irish traveled to NA on their very own! Read The Brendan Voyage by Tim Severin, who re-created the voyage of St. Brendan, known as The Navigator. They sailed north then west in a 30+ ft currach made from bull hides, ash wood, linen etc. Took Severin & crew two years - wintered over, just as St. B. probably did, then continued the next sailing season. Fascinating story.