I am not familiar with the h20, but, if it were me I would just buy the pc data cable.
I would then download the free version of Easy GPS.
Easy Gps allows you to manage waypoints, tracks, and routes.
I would also download Google Earth. You can look at your tracks and waypoints and routes on google earth and google maps free.
Easy gps saves files as gpx extensions.
You can used GPS Babel ( another free program) and convert the GPX file to KML files that google earth uses.
It is fun to mess with and easy to use.
These are good training/learning tools.
All gps do the same thing. It is not magic.
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