Adorno 说:
It puzzles me though that these Scandinavians (from modern Norway?) don't know England.
They're experienced sailors and do trade all over Europe, and yet they only know of England
as a mythological place - sailing towards it like Columbus towards India. Odd...
That's been my only real complaint. Greece was trading for Tin with England as early as 400BC, the Romans and all the Gallic and Germanic tribes were very aware of England hundreds of years before this show and by this period the Norse were raiding down the coast toward France and you can see England on a clear day from there.
I think there's essentially zero chance they didn't know of England. I suspect artistic license to provide context for the sun dial based compass for calculating latitude. The jury seems out as to whether those were in use at that time by the Norse. It's even further out on the use of a 'sun stone' to focus sunlight to make the device useful during overcast conditions. Still some artistic license is ok.
There are some other minor oddities, Floki is likely lifted from Floki Vilgerðarson http://en.wikipedia.org/wiki/Hrafna-Fl%C3%B3ki_Vilger%C3%B0arson who was credited as the first Norseman to Iceland and the use of released ravens to tell if land was nearby, a scene repeated in the 2nd episode. I do like Floki's character, he's fairly unstable.
Still I'm enjoying the show and particularly like how familiar it feels with respect to Brytenwalda.