# Technical specification

The **OS Net API** provides programmatic access to Ordnance Survey’s high-precision GNSS reference network across Great Britain. It enables developers and geospatial professionals to retrieve station metadata, monitor network health, and download RINEX v3 data files for post-processing and analysis.

This API is ideal for applications in surveying, mapping, infrastructure monitoring, and any domain requiring centimetre-level positioning accuracy.

## Base URL

```
https://api.os.uk/positioning/osnet/v1
```

## Authentication

The API supports the following authentication methods:

* **OAuth2** (Client Credentials flow)
* **API Key in Query Parameter**
* **API Key in Header**

### OS Net API

Operations providing access to OS Net:

<table data-view="cards"><thead><tr><th></th><th></th><th data-hidden data-card-target data-type="content-ref"></th></tr></thead><tbody><tr><td><strong>Stations</strong></td><td>Returns a list of OS Net stations, optionally filtered by time and location.</td><td><a href="../os-downloads-api/technical-specification/opendata-products">opendata-products</a></td></tr><tr><td><strong>Station Health</strong></td><td>Returns hour-by-hour health status of the entire OS Net for a given date.</td><td><a href="../os-downloads-api/technical-specification/opendata-product-details">opendata-product-details</a></td></tr><tr><td><strong>Rinex</strong></td><td>Return list of years with available RINEX data.</td><td><a href="../os-downloads-api/technical-specification/download-an-opendata-product">download-an-opendata-product</a></td></tr></tbody></table>