Google Earth lets you import the log data and save routes, add
place marks (i.e. customer pick up locations, or other points of interest),
add driving routes (to compare with the actual route taken, and it lets you
save it all within Google Earth for easy and free data management!
http://earth.google.com/support/bin/static.py?page=guide_toc.cs
You can view and download Google Earth tutorials and user guides here:
GPS LOG TO KML CONVERTER (for Google Earth)
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