Quote Originally Posted by jayem View Post
The rudder is around that time.
And at the start you have whatever made the longboat and dhow.

On the infrastructure, at the end of the period your vaguely getting dock infrastructure (, Liverpool has the pool sealed off at low tide (to keep the water in), while at the start you pretty much have to beach (and hench need the boat to be shallow, keelless, and realistically rudderless.
Galley rudders were removable so that they could back themselves onto a beach. Old fashioned "steering boards" could easily be lifted out of the way. Galleys did have keels. Cogs were flat bottomed, which allowed them to enter shallow ports, although I don't know if they could be beached easily.