: Also water warfare doesn't seem to figure prominently in
: any of the myth storylines. The ships that they have
: are small vessels meant for sailing rivers and have no
: cannons or armaments.
GURPS tells us that they do have fleets of ships - trading ships, that sail up and down the shore for easy transport of goods. Since there are no known inhabitants on other continents, or even any other really KNOWN continents at all, they tend not to sail much at all. Exceptions being the Berserks, and the former Yer-Ks.
: I suspect that this is 'cause the dead don't sail well ;)
They don't really need to, either. See above about there being no real need to cross oceans, and combine that with the undead's lack of breath, and you run out of a need for Dark ships very quickly. An advantage to this could be that folks could set out to sea with a store of food to avoid minor undead uprisings. Of course nobody could survive at sea for a thousand years, but whatever.