Ordnance Survey is the national mapping agency of Great Britain and operates as Ordnance Survey Limited from Southampton. It maintains a national topographic dataset, The National Map, and offers mapping products through OS Maps and an online shop. A data discovery page covering data, products and APIs also addresses developers, who can use the data through those channels.
The organisation is headquartered in Southampton, United Kingdom. As a UK company, Ordnance Survey falls outside EU jurisdiction, so a European organisation that uses its data or services relies on a non-EU supplier with a UK legal basis for processing. The website does not state where hosting takes place, and the datasets are not open-source software. For European buyers, the relevant questions are the licence terms and where any customer data is processed; national mapping agencies within the EU are an alternative that stays within the European legal framework.