Originally Posted by
CraigB
Garmin's speed reading was thrown off while riding on a moderately-wooded MUP. I know I was going at least 16 and it showed readings from 11 to 14 until I'd get into little clearings.
I have the wheel sensor (GSC10) that is supposed to kick in when the GPS is not working right. Like your exact situation. in theory
in practice, i get the same exact thing if its heavily wooded. i will be crusing at 16mph in the clear. but at the same cadence and same gear in the wooded i will get the 11mph-13mph reading. Took about two months of hammering thought that section to figure out that it was the trees not my effort.