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  • Google maps (RideWithGPS & all of those types of thing & thing) has my lap pegged at 2.1km, but my GPS has it at 1.86km.

    It means that my lap time are either 20 seconds above target, or they are 10 seconds over target.

    Have you uploaded to Garmin Connect? I think it uses Bing now, check the route that G-Connect outputs against the Bing maps distance, then report back

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