With some dedicated GPS conversion software like the GPSBabel that support a great range of various navigation, map or other GPS formats it should be quite easily to perform kml to upoi conversion. This is pretty much export or transfers of data from a Google Earth Keyhole format to a UPOI format useable in iGO navigation devices.
Open KML file Open UPOI fileProgram for Linux that allows users to convert waypoints, tracks, and routes between popular GPS receivers