How to edit a Google GPS Track File (.KMZ) ???
- Save your Google GPS Track File (.KMZ) as local file on your computer
- Download and install http://www.gpstrackeditor.com/
- Open this site: http://www.gpsvisualizer.com/convert_input, select your local file as input and the ".gpx" as output format and click on 'Convert'.
After that your new '.GPX' file is ready for download (click and download to local drive).
- Open the installed gpstrackeditor program and open the new .GPX file. On the right side you see all your waypoints edit them.
Most probably you will delete some of them because you forgot to stop your GPS recording at the end of the track (;-)). There's no multi select, but you can hold down your 'del' key as long as needed ... After that save your edited .GPX file, go back to http://www.gpsvisualizer.com/convert_input and convert this file back to .KMZ (Google Earth KML). Download your file and replace the original one with this corrected version.
Good luck and have fun !!!