Okay so jorb said he was thinking to add a very early game boat like a hollowed out log, here are some more boat suggestions to stretch our the spectrum of the boat tiering.
Viking Longboat - This could be a faster rowboat with a small sail, maybe takes a few moer people than what a rowboat does, everybody rows. Maybe that can make it across oceans but can sustain very little damage? Also small inventory, maybe not much more, or maybe no more than rowboat.
Corbita - Basically your standard water wagon. This would be the new "water hunting boat." Maybe this has the same inventory as a wagon, can take a good 4 or so people, is slow, expensive, but can travel through shallows and hold a lot of crap. Basically your answer to midgame rafts? Maybe this can cross oceans but sustain very little damage?
Knarr - Since this is basically just a water wagon meant to be for transport only, AND it's a huge ass boat, maybe they should no longer be ale to cross shallows? Make it for transporting livestock and mass goods across oceans only.
Galley - This should be like on the same tier as Knarr, maybe more expensive I duno. Should be the same size more or less but with very little inventory space. Later I figure the slots that are used for inventory on this boat could also be used to input spear launchers or w/e boat siege type things we will have. This should have higher soak that a knarr, maybe be faster and more specialized for combat. Also maybe not for shallows.
Also we need docks that are for small boats just because.