There are several online tools that support converting a navigation device output to a KML format. Here is a link of such tools:

  • MapsData – Convert Excel to KML, CSV to KML, SHP to KML, GPX to KML, KMZ to KML or DXF to KML by dragging and dropping your file.
  • GPS Visualizer – Convert GPX or CSV to KML
  • Excel to KML
  • GPX2KML – Convert GPX to KML