The View in Google Earth command in ExpertGPS allows you to view your
GPS data (waypoints, routes, and tracks) over the detailed color
imagery in Google Earth. To use the command, open a GPX file in
ExpertGPS, or retrieve the data from your GPS. Press F7, or click
View in Google Earth on the View menu. ExpertGPS will instruct Google
Earth to synchronize its map to match the map in ExpertGPS, and to
show your GPS data.

If Google Earth is not already running when you click View in Google
Earth, it may not show your data because it is busy initializing. To
prevent this, run Google Earth and let it finish initializing and zoom
in on the globe. Then click View in Google Earth in ExpertGPS.

You can also export your data from ExpertGPS to a KML file, which you
can then view in Google Earth. Click on the map in ExpertGPS, and
then click Export Data on Map on the File menu. Change the file type
to .kml, and save to your desktop. Open the KML file in Google Earth.

ExpertGPS cannot display Google Earth’s worldwide color imagery
directly. Google’s terms of use forbid this. You can, however,
export an image from Google Earth and use it as a Scanned Map in
ExpertGPS.

The ExpertGPS help file has complete details about preparing and
geo-referencing your maps for use within the program.
http://www.expertgps.com/help/calibrating-a-scanned-map.asp

To get rid of the warning message that your data is outside of the
United States, which appears when you are in Topo Map or Aerial Photo
Map view, click Show Quick Map or Show Scanned Map on the View menu.
Quick map will display GPS or GIS data for any point in the world over
a white background.