Very frustrated . . . old 305 with the sync block had enough issues . . . but using Garmin Express is total rubbish. Why is there no SYNC BUTTON in Garmin Express. Tired of waiting for it to decide to sync.
I am sorry for the frustrations. Be sure to use the Lap/Reset button on the 310XT at the end of each activity, after stopping the clock. Please see the FAQ articles below for suggestions on sync issues.
What can I try when my ANT Fitness device will not sync with Garmin Express?
https://support.garmin.com/support/searchSupport/case.faces?caseId={600f3dd0-3e6a-11dd-d7af-000000000000}
How can I resend my history from my wireless ANT+ watch to my computer?
https://support.garmin.com/support/searchSupport/case.faces?caseId={7576dec0-7533-11de-5495-000000000000}
If you continue to have troubles contact Garmin Product Support by phone.
