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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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Well_is_it
I can't work out how to use it either...
Is there an app? I'm a very casual user and use it to identify strange aircraft/noises mostly. Such as the very loud an-12 that went over earlier, amazing how much noise they make from 28,000 feet.