Software, apparatus and equipment used in or for asset tracking systems; computer and communication software, including software programmes for tracking by various means, including by gps satellite or mobile telephone, software programmes for tracking user locations, software programmes for tracking of people and plant, software programmes for asset tracking, software programmes which display location or tracking data in association with other data, and web server software; electrical tracking devices; target trackers, including satellite target trackers; tracking apparatus, including vehicle tracking apparatus; global positioning systems (GPS); apparatus for displaying information, including apparatus for displaying information as web pages on the internet or intranet and apparatus for the display of location or tracking data in association with other data; mobile communication terminals; mobile telecommunications apparatus