Free mappers at Birmingham conference to help with aid
6 September 2013 Last updated at 16:53 BST
Mappers who spend their time updating street maps for free are in Birmingham to share their skills.
The volunteers use their experience to update any online map, whether it is a street map or a map used to help with international aid.
Up to 300 are attending the conference and said they found Birmingham's maps to be already very well up-to-date.