This page demonstraits the offset between Google's satellite images and road maps. I have taken GPS waypoints in the centre1) of each road, and made each into a marker. As you can see, the road maps are accurate, but the satellite images are displaced in both coordinate directions.
<googlemap width=“500px” height=“400px” zoom=“18” type=“hybrid” lat=“-19.2675” lon=“146.8055” > -19.266500,146.805056,Greenslade St -19.267194,146.804972,Greenslade St -19.268111,146.804861,Cnr Greenslade St and Obrien St -19.268056,146.804278,Cnr Obrien St and Wilson St -19.268389,146.804833,Sturt St -19.267889,146.805667,Sturt St -19.267611,146.806139,Sturt St -19.267639,146.806500,Morris St -19.268333,146.807278,Flinders St -19.268833,146.805472,Ingham Rd </googlemap>