*It depends on what website you use. My understanding is that each
interpolates the same topo data base in its own way. Also, my impression is
that each website keeps tuning their algorithms in the hope of greater
accuracy. What's not clear is whether any of these sites get access to side
informati
Can't compare web to GPS, but I've found over the years that both
calculate more climbing than is shown by an altimeter watch or bike
computer. The altimeter typically shows about 30% less altitude gain,
probably because the mapped versions add up every little up while most
altimeters ignor
In mapping out routes, I've noticed big differences in both distance
and elevation gain between GPS and plotting the same route on web
based mapping services. Distances can be off by 5%-10% and elevation
by double. The web based systems are always higher than GPS. Has
anyone else encountered th
