GPS is great when you’re doing outdoor activities, but coming back to your computer, it’s sometimes a little bit tricky to use the output data, in my case, namely the KML / KMZ file.
Indeed, the GPS terminal records coordinates, altitude & other info each X seconds. It means that if you record your track for a time with a high rate recording frequency, your KML file is going to include thousands of points…
Everything is fine with Google Earth when you import your KML file, but some issues appear when you wanna import it in Google Maps (for instance, the tracks will split in several parts).
Indeed, if your KML polygons have too many points, the file will be too big for Google Maps.
Only one solution: reduce the number of points (and coordinates).
Here comes GPSBabel.
GPSBabel converts waypoints, tracks, and routes between popular GPS receivers and mapping programs. It also has powerful manipulation tools for such data.
For instance, in order to reduce the number of coordinates, you just have to apply one of the filters: