for example, this little town is just about 73 n latitude:
> The town was founded as Upernavik in 1772.[3] From the former name of its island, it was sometimes known as Women’s Island; its name was also sometimes Anglicized to “Uppernavik”.[4] In 1824, the Kingittorsuaq Runestone was found outside the town. It bears runic characters left by Norsemen, probably from the late 13th century. The runic characters list the names of three Norsemen and mention the construction of a rock cairn nearby. This is the furthest north that any Norse artifacts have been found, other than those small artifacts that could have been carried north by Inuit traders and marks the northern known limit of Viking exploration.
https://en.wikipedia.org/wiki/Upernavik
Well, maybe, but I’m still skeptical. The last record of European activity on Greenland was just after 1400 and it is estimated the last settlement was abandoned mid-century because of the cooling climate. So, why would someone want to go there? The best fishing was to the southeast.