Fri Sep 12, 2014 9:38 am
They do two things :
1. increase your naval pool tranports (useful when you dont use dedicaded naval tranport ships for unit moving)
2. increase numbers of ships that you can simulatenously build at that region (at low lvl only 1x ship, at max you are mostly limited by force pool)
3.to some degree they speed up building of ships (e.q 200 days at higher lvl compared to 360 days at lvl 1).
and for most advanced ships/best build times you need naval base (upgraded port ).
and for another speed build up you can build shipyards in that region too (industry building)