Sounds like the sort of knowledge that would be very valuable for commercial reasons.

From this 'commercial' point of view is probably exactly one of the important reasons that the Norse people did not dare to establish a permanent settlement in Newfoundland, I suppose, as I wrote before in Why didn't Columbus/Spain know about Leif Erikson?

Compared with Greenland, Newfoundland:

• is too far distant from the market in Western Europe to come and to go by way of the North Atlantic not so easily as Greenland (even later medieval Europeans sometimes had trouble in maintaining the regular contact with the latter in course of the 14th century).
• didn't generally have the animal and birds that were valued in European market, such as Walrus (for tusk) and gyrfalcons.