> In the source code i can understand the co-
> ordinate part its the creating the specific route that seems to be
> encrypted/coded as sjown but the gobblegook as shown above.

Keywords : encoded polyline
http://code.google.com/apis/maps/documentation/utilities/polylinealgorithm.html
better description
http://facstaff.unca.edu/mcmcclur/GoogleMaps/EncodePolyline/
The 'levels' part isn't used in v3 API
http://code.google.com/apis/maps/documentation/javascript/geometry.html#Encoding

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