Anyone who uses Google earth
to create charts
or use as a navigation
program should be aware of the Terrain problem:
If you have Terrain turned on Google
earth's positions will be very different from your GPS
position. The testing I did showed it be off by as much as 600 feet.
This problem is more apparent in the newest version of Google earth
(V5.2) because it turns on Terrain by default. In the new version, Terrain is an option in the 3D View (Show Terrain - checkbox). In versions prior to 5.2, Terrain was a layer that you turned on or off.
When Terrain is off, I have found Google
earth to be VERY accurate.