Sea building of the Medieval Era. City must be built on the coast. * Forms a Trade Route (City connection) with the Image:Capital5.png Capital over water * +1 Image:20xProduction5.png Production from all Sea Resources worked by the city. * +1 Image:20xHappiness5.png Happiness with Naval Tradition Social policy * +1 Image:20xGold5.png Gold with Merchant Navy Social policy