> For the complete documentation index, see [llms.txt](https://docs.os.uk/os-downloads/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.os.uk/os-downloads/products/addresses-and-names-portfolio/os-emergency-services-gazetteer/os-esg-technical-specification/code-lists/rpccode.md).

# RPCCode

The code list identifies the accuracy value of the coordinates allocated to the feature. This code list is used in association with the RPC (CSV) / rpc (GPKG) attribute found on the [BLPU table](/os-downloads/products/addresses-and-names-portfolio/os-emergency-services-gazetteer/os-esg-technical-specification/feature-type/blpu-type-21-record.md).

<table><thead><tr><th width="96">Value</th><th width="122">Description</th><th>Implementation notes</th></tr></thead><tbody><tr><td>2</td><td>General Internal Position</td><td>The address seed is contained within an OS MasterMap Topography Layer building but is more than 2.5m away from its calculated centre.<br>Or<br>The seed is in an internal position based on the nature of the premises, for example, Development Land, House Boat.</td></tr></tbody></table>


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