Ordnance Survey celebrates its 220th anniversary this year, the map-making agency has been based in Southampton since 1842. To mark the occasion, a new exhibition in the city's Maritime Museum is charting the role of the organisations surveyors, cartographers and printers over the years.
Take a look at some of the photographs with Phil Watts from Ordnance Survey - and see some of the early equipment and techniques used in mapping every part of the UK.
Ordnance Survey in Southampton: Mapping Great Britain Since 1791 is open at Southampton Maritime Museum until 5 June 2012.
All images subject to copyright. Click 'show captions' for details.
Music courtesy KPM Music. Slideshow production by Stephen Stafford. Publication date 14 February 2011.
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