You can call GDirections and tell it not to display the data on the map.
Use {getPolyline:true} to tell it to fetch the data, because it
otherwise doesn't fetch stuff that it doesn't intend to display.
Listen for the "load" event that tells you that the data has arrived.
Use .getPolyline() to get the polyline.
Use EPoly.getPointAtDistance() to calculate the latlng of a point at a
specified distance along that polyline, and plot your marker at that
point.
This sort of thing has been done for charity walks, where the "progress"
of a large number of small walks by many individuals is charted against
the equivalent of walking from one side of Canada to the other, but
usually they plot either the whole polyline or plot the part of the
polyline that has been walked.
--
http://econym.org.uk/gmap
The Blackpool Community Church Javascript Team
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