Raft

A raft can only be build using a dock. It comes with a sail, rudder, sleeping bag, map, and crafting box. The raft will not move or drift if the player is not steering it. The raft is moved by clicking the "use" button while looking at the rudder. The player then uses the WASD keys to move. This is the only unit in the game that can navigate in this way. All other units are stationary.

When the raft gets close to a dock it will automatically align itself with the dock and lock in place until the player moves it again.

It does not appear that the raft can be capsized at this point.