Open Canal Map UK is a free iPhone application designed for travelers and boaters, providing a detailed map of the United Kingdom's navigable canals and rivers. The map integrates public data with user contributions, featuring essential points of interest such as navigation markers, boater services, and commercial facilities useful for long-term cruising.

Users can actively participate in enhancing the map by adding missing items, contributing to the growth of the database. With over 700 user-submitted entries, including convenience stores, mooring spots, and unique locations like private marinas, the map aims to be a comprehensive resource for boaters. Regular updates ensure that new user contributions are seamlessly integrated, keeping the map current and relevant for all boating enthusiasts.