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I use a Garmin Edge500. I upload to the Garmin website, and the site shows a gradient map of the ride, among other things. The grade and altitude measures do have some error. But I can also monitor this during the ride and get a better idea of what various grades feel like. As an example of inaccuracy, a bunch of us who did the Santa Fe century on Sunday ...

Get a Sky Mounti inclinometer: Not terribly accurate, and not much use on rough pavement, but it gives you an immediate readout that doesn't "smooth over" the ups and downs the way that maps will. (I should state that it has a problem on level ground -- the faster you go (especially on rough pavement) the higher it reads. But get on a grade over 4-5% ...

There are various web sites that might help. I use one called http://ridewithgps.com. You need to register on it but you can get quite a lot from a free account. Does your GPS device output GPX files? If so, I think Ride With GPS can suck them in. If not you might have to put your route into the site manually (but this is easy enough). But what you do get ...

I have found a site with a user who appears to have gone to considerable effort to plot and upload many stages of many tours, including Tour De France 2013 and Giro D'Italia 2013 and many others. You can view his list here: http://www.gpsies.com/trackList.do?username=Daniano From my sampling, they appear to be pretty accurate, but, they are not official.