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London Fixed Gear and Single-Speed is a community of predominantly fixed gear and single-speed cyclists in and around London, UK.
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@silv3r
you can already do something similar using mobile phones. all you need is a small receiver (a cheap mobile phone) and use a service like this http://www.traceamobile.com/ that essentially connects to the mobile phone being tracked and triangulates its location. i've been looking into developing a bike specific one - and i think i can get it down £20, minus the service.