Route Problem

[rayckng]

I used GMDL ver0.5.04b to create a Hong Kong map from Google map and then I created a route in the "Directions" tap (als o from Google map). Then I put the Route POI file into my PSP and browse, I find the route seems drift in both Long/Lat. The whole route is drifted to the East about 500m and to North a little bit.
Is it a problem of Google Map and can I adjust it from GMDL or the map This?