Been playing about 24 hours now and so far I like what I see. Sent a couple of bug reports on game crashes in battles. I am still considering feedback in the broader sense, but there are three things that have struck me right away.
Formations. so far you have line astern and line abreast. You might consider adding echelons to these options.
Altering the course of the guide (lead ship) in line astern works as one might expect that all subsequent ships (more or less) follow in the wake of the lead ship. There definitely ought to be the option to have all ships in a formation turn simultaneously. This was often used for manouevering into battle and in battle, allowing for all broadside to be brought to bear on the enemy simultaneously.
Divisions seem to, on occasion, wander off and do their own thing, particularly when the lead ship of the division has to drop out of formation owing to damage.
Apologies if this is repeating what others may have posted already, but i have not yet had chance to read the forums in their entirety.