Advanced Sea building. Requires Harbor. * +1 Image:20xProduction5.png Production and Image:20xGold5.png Gold from Sea Resources worked by this City. * +15% Image:20xProduction5.png Production of Naval Units in this city. * +1 Image:20xHappiness5.png Happiness with Naval Tradition Social policy * +1 Image:20xGold5.png Gold with Merchant Navy Social policy