@tank-nut Hey there!
So, there’s a bit more to it than that. There’s probably a lot of parts of the game that are related, but I’ll try and keep confined.
So in A&A, naval bases just increase movement. This has more than that.
There’s 3 types of naval bases. 1) Port, 2) Dockyard, 3) Shipyard.
Port.Ports grant an extra movement for ships just like A&A. But they also are used as supply paths for Lend Lease. In GW36 you can lend lease to other nations, but they have to go through ports/undamaged railways, etc. So port can be very important for shipping lend lease supplies/units. You can send $3 worth of money or units through a minor port, and $5 worth through a major port. You can place these anywhere that has an ocean border. Also, it’s only a major port that grants the movement bonus, not a minor.
DockyardsDockyards can do the same things as ports, except while a minor dockyard can only support $3 worth of lend lease, a major dockyard can support unlimited amounts of lead-lease material. Dockyards can also be used to repair capital ships. Same as above, only major dockyards give movement bonuses.
ShipyardsShipyards can do all the same things as ports and dockyards. The difference here is that they can also produce ships, 1 non-capital ship per turn for a minor dockyard, and 5 ships of any type for a major dockyard. Major dockyards can only be build in your home country too, you can’t build them in overseas and/or conquered territories, etc. Same as above, only major shipyards give movement bonuses.
Hope that helps! It’s a lot to keep in mind for sure!