When I mark a new waypoing on my Garmin ETrex Vista HCx and then download from the GPS device to mapsource to an existing file all the sites have duplicate, triplicate, or more names for the sites when I view them in Google Earth and I can't figure out how to delete all of the replicated names so that they each only show one name.  The file in mapsource shows only one name for each site but shows multiple names on the Google Earth map.   I would appreciate help in how to delete the replicated names and how to prevent this from happening when i download new waypoints in the future.