this product
The Timex Ironman Speed & Distance consists of two pieces: a GPS reciever and a watch/monitor that are wirelessly connected by a radio signal. The reciever scans the skies for satellite signals looking for the best geometric solution (through a process called "triangulation  and transmits precise speed, distance and pace readings to the watch in real time. While GPS tecnology is most commonly used as a navigational tool, the satellites are equiped with atomic clocks, making it possible to get speed and distance data with pinpoint accuracy. Available with Black band (buckle).
http://shop.store.yahoo.com/goldeney...gpsspeedd.html
my friends who bike like theirs
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