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830 not measuring speed and distance

Hi,

I have recently got the 830 and having difficulty getting it working properly.

i have connected it to my wahoo speed/cadence sensor, but when I ride, it doesn’t seem to measure speed or distance accurately.  It measures cadence ok and displays blips of speed, but very low and not correct.  I’ve changed the battery in the sensor, done a hard reset of the 830 and reconnected the device. These things didn’t work.  Interestingly, when my fenix 5s was also connected to the same sensor, the watch was able to measure speed, distance and cadence correctly, so the issue must be with the 830.

the 839 works fine when connected to my tacx neo.

does anyone have any ideas about what the problem is?

thanks,

sam