Harbour V4 for Foundation is a free utility mod designed for Windows, enhancing gameplay in the game versionThis mod introduces various features that allow players to manage maritime activities more effectively. Users can build custom docks and piers, set up light towers, and manage boat imports and exports using a parts list for each vessel. The mod requires the 'Windows Decoration V4' for optimal performance, ensuring that players have the latest enhancements available.

The mod allows for customization of ship sails and lighthouse roofs through themes, offering a visual personalization aspect. Players can also incorporate additional resources like salt and sugar by installing the optional Common Resources mod. The gameplay includes assigning sailors to ships for trading and sailing, with a system for tracking gold coin transactions under quests. Overall, Harbour V4 enriches the gaming experience by providing essential tools for waterfront management.