Originally Posted by
BlazingPedals
My thought was that if he'd somehow set the clock on his Garmin to a minute ahead, it would look like what I saw. But I thought they get their time signal from the satellite? Anyway, to restate the problem, in real life sometimes he led during the ride and sometimes I did; but the flyby showed him in the lead all the time. There were no KOMs involved.
If you're both using Garmin, the time-stamp should be the same (give or take 40 ns) . However, if the other rider is using a phone app, the time may be off on the phone. I do not have any experience with this issue, just putting the idea out there.