Originally Posted by
tomato coupe
That's one piece of the puzzle, but it isn't a serious issue unless the route is very curvy, like you might encounter mountain biking. On typical road routes, it doesn't introduce a significant error.
There's still no reason to expect that GPS will be more accurate (over longer distances).
Even though it's "not a serious issue" (I said it was a bit), it means GPS won't be more accurate.
GPS also has issues with reception, which has more opportunity to happen over longer distances.
Garmin prefers the distance and speed from the sensor over that from GPS. They aren't doing that because the sensor is less accurate.