I may be wrong, but I assumed Neil was just making a joke. The questioner didn't say they were going 'round' Norway, they said they were going 'through' Norway, which sounded as though they were going over the land. That would indeed be bumpy on a ship!
Incidentally, I've been on a Princess Cruise to Oslo and it's a really nice place. Have a great trip.
I can only concur with the previous writer, I was having one of my rare facetious moments for which I take full and complete responsibility. Also Oslo is a great place to visit there is a great deal to see and do there but their drinks are expensive. regards...Nei.