What Marty said, supposed to take place south sweden/denmark, while it looks VERY west norwegian/northeast sweden with how rocky it is being in fjords (vikings in fjords??). Besides how it looks geographically, it doesnt make sense that they dont know how to get to England/France by that time frame (I mean shetlands is just close by for them for once, and dannish vikings been raids to UK quite a bit before that time, bound to heard about directions by then). Plus geographic descriptions confusion took me out of the experience a little, they kept saying russia is to east (pedantic, but weird to call it russia, since the very name of russia originates from vikings ruling of "russia" century later)) and UK to west, which makes for middle/south sweden based vikings, but since it was so fjordy and looked REALLY like norway based vikings, they would quite unlikely be raiding baltics/russia which is quite long way around for them. And UK wouldnt be west to them, but to the south. They tried to escape these headaches by simply calling it scandinavia, but still details could be better.
Also, wtf was with the water compass and the sunstone? Unnecessary.
All in all, I still like it though