Build Navy, Control Seas, and Optimize Markets

Step-by-Step

Go to the Naval tab and build ships to control coastal provinces and key sea routes.
Assign admirals and naval cabinet positions for maximum fleet effectiveness.
Construct docks, shipyards, and market buildings to boost trade and naval supply.
Optimize markets by focusing trade on your capital and most profitable goods.
Use your navy to protect trade, block enemy fleets, and support expansion overseas.

Strong navy ensures dominance of sea trade and allows safe expansion across water.
Optimized markets increase income and trade power, funding further growth.
Naval superiority can be decisive in mid- and late-game wars.