I have a GPX route, I imported it into Google Earth. Everything is fine, so I saved it as KMZ file. Then just for check, I imported KMZ back into Google Earth. No problem.

The thing is, I would like to work with Google Maps, no Google Earth and I am not able to transfer this route into Google Maps. Each time I select "show in Google Maps", the view is switched from Earth to Maps, but my route is missing.

If I use standalone web browser and try to import any of the files directly to Google Maps, either it falls into some infinite loop (I wait ~hour and still see progress bar) or Google Maps shows error.

Thus the question: how to transfer a route from Google Earth to Google Maps?

The size of GPX file is 3MB, the size of KMZ is 1MB.