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Is speed/average speed reasonably accurate on a GPS device without a speed sensor
Yes, no problems with just using the GPS with no speed sensor. Most of my rides are logged that way as I'm either using a Forerunner 110 (a running watch) or when I do use my Edge 705 it reminds me that the battery in my GSC-10 speed/cadence sensor ran out years ago.
Greenbank
Is speed/average speed reasonably accurate on a GPS device without a speed sensor? I know there'll probably be a lag, and the occasional weird bit where it shows a speed of 0mph or 200mph, but can they generally show usable average speed?