I agree that ship movement rates are anaemic, in all ages. In fact it's arguably worse for the older ships - sailing fleets had true strategic mobility in an age when armies moved at walking pace.
But you'd want to differentiate between sailing from A to B and exploring. It's a lot easier to navigate to a destination if you can just point the ship in the right direction. If you are wandering around looking for things, it would be slower. (I have no idea if the game even has the ability to include a "move slower in unexplored territory" feature.
Regarding ships not being powerful enough? Well, there I'm not so sure that is true. A battleship has, what, 9 big guns and 20 smaller ones (taking USS New Jersey, say). Sounds a lot. But an armoured brigade (which is what I presume a tank unit is, no way is it one tank!) has the guns of all the tanks, plus the supporting artillery, etc., etc. It might even have organic helicopters. So for a battleship to have approximately the combat strength of a tank in the game is reasonable - perhaps even generous)
It's never really spelled out in the game, but clearly units, although referred to in the singular, in fact represent large bodies of men. And you need to factor in support units and infrastructure too. So say each unit is meant to be 1000-5000 men, roughly. That's the aforementioned armoured brigade, probably about 100 tanks. Or it's one battleship (crew in the thousands). Or it's a squadron (or perhaps a wing?) of aircraft - 12-24 aircraft, perhaps only 50-100 pilots, but a LOT more mechanics etc etc.
That's, incidentally, a good reason for 4 (or so) aircraft units on a carrier to be reasonable. If each unit is "really" 12-24 aircraft, then it works out quite well.
But, of course, the fundamental problem is that there is NO SCALE IN THIS GAME. I've seen maps of Poland, say, or Iceland. Or maps of the world. I bet there were waaaaay more tiles in the map of Poland than the same area got in the map of the world. So to try to extrapolate the game scale from a map is futile. You could use another map and get another scale. So any "realistic" mod has to have a fixed map, too. (That 8 or 12 tile strategic bomber in the world map looks pretty darned tactical on the map of Poland)
Hmmm I'm sure there was a point when I started
