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//Don't supply a map to GDirections()
var direction = new GDirections(); 

//Make sure {getPolyline:true} is given to the load function
direction.load("here to there", {getPolyline:true});

GEvent.addListener(direction,
                   "load",
                   function(){ map.addOverlay(direction.getPolyline()); }
);

разработка GDirections, getPolyline, google, javascript, Map, маркер. GMap