Can I upload a Google Earth KML/KMZ file for inclusion on a MyTopo custom map?
However, you can upload your KM./KMZ file to the converter at GPSvisualizer.com and create a GPX file from it. You can upload this GPX file to our search page and build a map using it, with some basic symbol types.
For more details, including more professional mapping options, please see: Adding GPS points and labels to MyTopo maps