Freely available mapping services:
- OS Open Data gives access to freely available maps from the Ordnance Survey
If you have a smart phone you might like to try out the FieldTripGB App
Fieldtrip GB is a mobile mapping and data collection app that is available for iPhone and Android devices. It has been developed by EDINA, based at The University of Edinburgh as a free app for academic use and it allows you to collect data against high quality cartographic maps. The main features of the app are:
High quality background maps that offer rich data in both urban and rural environments
Map caching to allow off-line use
Custom data collection forms that allow users to define the data they want to capture.