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Careful, I thought I could get away without the bundle because I already had cadence and speed sensor but they did not work and the GPS used satellites which were really inaccurate readings. My speed would read 34mph then it would read 11mph. At no time during the ride was I going either of those speeds. My mileage was also off.
Maybe yours is defective.

I use mine all the time without speed/cadence sensor. It's accurate with others that I ride with. Last ride was 34mi. It was within 0.2mi distance of three other riders and within 0.1mph average speed.
 
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