Each port has a series of building facilities, divided into public buildings and user buildings. Public buildings can be accessed by all users, while user buildings require users to create credentials to use. User building information will be recorded in the credentials.
Port buildings are independent entities in different ports, such as factories in different ports being different. Apart from the initial port, users must have a ship docked at the port to use the corresponding buildings of that port.
User buildings are also independent, such as shipyards. Users who create shipyards at Port A can build ships at Port A. When users arrive at Port B, Port B will not share Port A's shipyard and will need to be rebuilt. Generally, user buildings have different characteristics in different ports.