It's pretty easy to figure out the kind of boats that are available. Most of the world is looking at anything that would be available in the 1500's. Usually Connlaoth is ahead of the standard in technology by around 100 years. That's what I've deduced from other tech advantages they have, such as in guns, cannons, and medicine. Magic though is always an option if you want things to be a bit more advanced or powerful. Now as far as Navies go, I don't know that anyone has one. Navies usually are established to make war across oceans. There may be fleets of ships, but Naval battle doesn't seem all that practical for a single continent.
@Tally and
@Rhi-Rhi will have to give us the facts on that of course, and if anyone has a Navy, I would think it would be as was mentioned before, Connlaoth and Adela. Serendipity may have one if the other two do, but its more likely that they all have trade fleets, and then there are privateers and pirate hunters. I'll text Rhi and tell her to poke in here.
UPDATE: So from what Rhi is telling me through text as she does grocery shopping, is that practically all the major countries have navies. She can clarify for us when she gets home, but you're pretty safe basing your Naval Captain in just about any major country.
