# Release Notes {% hint style="warning" %} #### Product has reached its End of Life (withdrawal) date The OS MasterMap Water Network Layer product (also referred to as OS MasterMap Networks – Water Layer) reached its End of Life on **31 March 2026**. As of this date, Ordnance Survey ceased to maintain or publish updates to the product, and access to the product was removed from the OS Data Hub, OS Features API and OS Vector Tile API. Supporting product documentation will be removed from this site 12 months after this date, when access to existing data packages in the OS Data Hub is no longer available. Full details, including migration information and FAQs, are available on the [OS MasterMap Water Network Layer End of Life information page](/os-downloads/resources/product-resources/end-of-life-product-documentation/os-mastermap-water-network-layer/end-of-life-notice-os-mastermap-water-network-layer.md). {% endhint %} ## [OS MasterMap Water Network Layer – January 2026 release note](/os-downloads/resources/product-resources/end-of-life-product-documentation/os-mastermap-water-network-layer/release-notes/january-2026.md) This release note provides information about the January 2026 release of OS MasterMap Water Network Layer. This is the final release of the product. ## [OS MasterMap Water Network Layer – October 2025 release note](/os-downloads/resources/product-resources/end-of-life-product-documentation/os-mastermap-water-network-layer/release-notes/october-2025.md) This release note provides information about the October 2025 release of OS MasterMap Water Network Layer. ## [OS MasterMap Water Network Layer – July 2025 release note](/os-downloads/resources/product-resources/end-of-life-product-documentation/os-mastermap-water-network-layer/release-notes/july-2025.md) This release note provides information about the July 2025 release of OS MasterMap Water Network Layer. ## [OS MasterMap Water Network Layer – April 2025 release note](/os-downloads/resources/product-resources/end-of-life-product-documentation/os-mastermap-water-network-layer/release-notes/april-2025.md) This release note provides information about the April 2025 release of OS MasterMap Water Network Layer. --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://docs.os.uk/os-downloads/resources/product-resources/end-of-life-product-documentation/os-mastermap-water-network-layer/release-notes.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.