TrippyZ: I'll try this out. Just need to learn how to install OpenStreetMap Maps but this seems to be not that difficult. Another option could be http://www.gpsvisualizer.com/map_input
I've created now my own litlle tool to display multiple tracks on on map. I've just started and most of the things are not working but you can show already multiple runs on one map to compare the GPS data. The tool is programmed in VB.NET and creates during the runtime java script to display the data on an OpenStreetMap. Your virus checker may not like this.
How to use: 1) File -> FIT file Open .... -> Select the files you want to show (you can't display more than 10on the map) 2) Select in the data grid all the files you really want to display 3) Press "Display on Map"
I made some changes in V1.0.3. - Handles the exception when clicking to the top row from data grid view - Handles for different map styles - Browser window adjust automatically when chaning the window size.