a lot like Mars
Not remotely close. In the worst of conditions in Iceland, I could walk around for minutes totally naked in the worst conditions, go back inside, dink some hot cocoa and be ready to do it again in a few hours. Mars, you'll be unconscious in 12 seconds if you space suit springs a leak and dead in 4 minutes. Iceland wait a few hours until the storm goes away, put on a heavy coat and spend a day out ice fishing. Mars, pour some hot water onto you freeze dried lasagna while looking out the window.
The trip to Iceland back then was as risky as it goes. Navigation was difficult, a storm could sink the ship, disease could not be cured. No steel boats, just wood and sail.
Plus you never knew what happened to the other crews. Did they survive or not? They could have a happy life, but no communication back to the motherland. Missing Iceland and ending up in Greenland without knowing it - totally possible.