Ships

Ships are in an intermediary period in this time. Some are powered by sails, others oars, and a few have a mix of both. Most that are built in Europe is split into two types (including how they are built). The clinker method is used in the north, where the planks are laid over one another to avoid leaks & such. In the south carvel is used, were the planks are laid side by side, and stuck or nailed to an inner structure.
A steering oar or side rudder is used, and a few are now being built with a stem rudder instead. Ships during this time are used for a number of reason, usually war, trade or exploration.
A knarr is an early form of long ship that is used by the Vikings. It is quite a large ship wit ha square rigged sail instead of oars.
Cogs & Hulks are starting to appear, at least in very small quantities and aren't as reliable as to what they will become 100 to 200 years later.
Galleys are used regularly in the Mediterranean peoples due to to it being tried and tested oar powered vessel dating back to the early Roman period. 
The long-ship of the Vikings appeared during this time. Primarily using oars, it has a slightly curved, almost flattened bottom allowing it to travel up larger rivers, be beached easily, and even dragged over land if need be.
The latte two relied partially on sails as well, to help travel any distance.