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Sync Edge 520 with heart rate of Forerunner 735XT

Former Member
Former Member
I hate to wear the HR strap but I have the Forerunner 735XT with built-in optical HR too. How can I sync the Forerunner's HR with my Edge 520?

The problem: tracking my rides with the Forerunner 735XT gives not so good results as with the Edge. Using both show differences in speed, time and distance. It's also annoying that auto-snyching with Strava has both activities online.