To convert a GPX file, you can use a free desktop application like GPSBabel. This software lets you convert GPX to a variety of GPS file-formats including FIT, TCX, KML, KMZ, WPT, and more.

How to Use Google Maps to Create a KML File. Google Maps makes it possible to build a customized map, such as one that marks landmark locations near your business. Keyhole Markup Language, or KML ...