Using Garmin530 with an external heart rate sensor whilst cycling.
Heart rate zones and my age are set correctly in Garmin Connect and show correctly on device.
Device is recording heart rate correctly showing average and max as I expect.
However after the ride, when viewing the graphs for Time In Heart Rate Zone the max value is different to the device and the zones are wrong.
Any idea how this can be fixed - the data is useless as it is…