1) As far as I am aware they were pretty much focussed on Newfoundland with some possibly going as far south as Maine. But as far as I am aware, it is all just guesswork, with the only hard evidence being in Newfoundland and other Norse artifacts are as likely to have been moved south by natives as by the Norse.
2) I believe that it there is support for the idea that various fishermen (Basque, Portuguese, and/or Bristol come to mind) fished the Grand Banks. A problem with this is that the fishermen would have wanted to keep rich fishing grounds secret from competition.
2) I believe that it there is support for the idea that various fishermen (Basque, Portuguese, and/or Bristol come to mind) fished the Grand Banks. A problem with this is that the fishermen would have wanted to keep rich fishing grounds secret from competition.