I have upgraded my Garmin computer (from 1030 to 1050) and I have discovered that there are discrepancies in the new device. the accuracy of the Strava live segments differ from what appears in Garmin for up to 10-12 seconds. I have it set up to 'Best accuracy' Multi Band GPS yet I am seeing the difference if I check in garmin and strava for the same segment.
Hope you can help,
MS