Originally Posted by
tomato coupe
No accumulated error other than the calibration? That is the source of error.
If you double the distance, you double the error. That's a linear relationship.
No. When you double the distance, the errors do not double, i.e. it is not a linear relationship.
I think yes, it does double the error with double the distance when you use GPS only. GPS smooths the small curving path into more straight lines. That does add up linearly with distance. I'm talking about both the serpentine path that your bike takes, and the larger radius curves. GPS only estimate that. In addition, many GPS errors accumulate from other sources as well, and you'll see jagged paths for instance.