Well, that's a little disappointing, but I think I figured something out that will do what I'd like. I made a route which covers the trail I'm interested in. When I was creating the route, some of my waypoints were slightly off the My Trails trail because they were not labelled as the trail - they were labelled with an elevation instead. So, that gave me a good trail distance (compared to my guide book). Then I tried to view an elevation plot and got the message "Route Calculation Error" - what does that mean? (I agree with several other members that Garmin's documentation leaves much to be desired) I thought it might be because not all my waypoints were on the My Trail - but they all had elevation data - so why doesn't it plot? Thanks again for your help.