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I'm working on my own lap timer iOS app and handlebar mounted bluetooth button called Cyclaps. The bluetooth button mounts on your handlebars and communicates directly to the Cyclaps app to start/stop timing and mark segment times. Just hit the button on your bars next to your thumb. It can be MUCH more accurate than any GPS and you can time anything/anywhere you'd like. The Cyclaps app can be set to record simple times or segment times. All lap times are recorded to a file on your phone that can be filtered and shared. Cyclaps does not use any data...