Google Earth

Google Earth is a tool showing earth imagery along with elevation contours. It allows adding overlays in KML/KMZ format, and these are what I've used to add color-coded routes. Multiple routes may be added, and turning on/off these routes is easy to do. The entire group of routes may be encapsulated in a single file for sharing with others.

Creating KML from GPX

This assumes you have already captured a route in GPX format (using for example), and then have saved that GPX file to your local drive. It is also possible to have GPS Visualizer accept the URL of the GPX file on the internet.

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