Royal Mail GPS trials begin in East Anglia
18 July 2012 Last updated at 19:45 BST
Postal workers in East Anglia are using satellite receivers to map the exact location of every property in a Royal Mail trial to improve sat-nav systems.
The devices record precise property co-ordinates in Essex, Cambridgeshire, Lincolnshire, Norfolk and Suffolk, but do not take photographs.
Nikki Fox reports.
Archive clip courtesy of British Pathe