A group of volunteers are walking the streets and lanes of Rutland in an attempt to map the county.
The amateur cartographers are walking along every rural road, cul-de-sac and path as they attempt to build up a new map of England's smallest county.
Volunteers are given Global Positioning System (GPS) sets, and pen and paper to keep a record of where they are going.
The GPS information is uploaded to the internet at the OpenStreetMap website where it can be accessed for free.
It is the first time in the UK that volunteers have tried to map a whole county in just two days.
Organisers are appealing for local cyclists and walkers to join in.
OpenStreetMap is a voluntary not-for-profit organisation that aims to provide free map data to the public.
The resulting map will be available on the internet.