Originally Posted by
BlazingPedals
if you're measuring a 20% grade and you incorrectly use the distance traveled instead of the horizontal distance, you'll be off by 0.4%. For lesser grades, the inaccuracy is less. My conclusion: it's not exact, but it's close enough fer gov'mint work.
Definitely. I never said it mattered.
Besides, given the wildly varying elevation figures I find for the same routes on different sites and different GPS devices, you could probably round off any calculations to the nearest 5%.
