Constructing any Royal Navy Dockyard grants you a copy of the strongest naval unit you can build. Naval Melee unit can escort units with it move at the same speed. Whenever you recruit a Great General, gain 1 envoy. Increases Trade Route capacity by 1 each time a Royal Navy Dockyard district or buildings inside a Royal Navy Dockyard District is constructed in your Capital. Gain the Redcoat unique unit when the Military Science technology is researched.