Greenland’s population was stuck there, because there are no trees to build ships; the likelihood is, they worked their way south toward other known settlements as well as they could during the daytime months, then eventually either got picked up by visitors (notice CC’s reference to English traders from Bristol who plied their wares in Greenland) or they died out.
I saw a documentary several years ago where a multidisciplinary team took a close look at the last Norse settlement. They concluded the evidence pointed to a sudden abandonment. They acknowledged several possibilities where the settlers could have gone, but their best guess was a ship picked up the last of them.
I realize there’s a reference to plying wares in Greenland, but am highly skeptical. No Norse settlements remained to sell stuff to, and the Eskimos weren’t much of a market.
Eskimos managed to get around on the water just fine. They built kayaks and larger boats out of driftwood and skins.