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Is it possible to overlay your activities on to one map when using poor man's free Strava?
Veloviewer does it, but no free anymore.
Viewranger also....
onto OS - Veloviewer had the map flipper utility - but it does still work from VV itself.
I've used http://www.gpsvisualizer.com/ to create nice single maps (choice of formats) with a load of GPS tracks. You'd have to export all your Strava activities to GPX though, which might be time-consuming. Not sure if there's a batch export function. Viewranger can put multiple tracks in a single file.
http://www.jonathanokeeffe.com/strava/map.php
And from my brief trial of premium, this guys site does it better. Worth looking at his other stuff too as it is quite good. I used to like veloviewer but not enough to pay - wish they'd put the score thing in strava as that was a good measure of form. Also a better way to look at my own routes would be good - I always struggle to find old ones.