I do love Google Earth
and the satillite views. I would depend on them in places like Maine
where those rocks are staying put in one place, but I can't see any reason to rely on these images
in areas of shoaling. I notice when I look at marinas
that I'm familiar with on the Google
satillite images there are often changes in the docks and the vessels. Within towns there are bulidings that have been demolished an new ones bulit. It's my understanding that the Google map updates average one to three years.
I will not rely on the position of shifting mud or sand shoals as presented on google map views. Of course, this doesn't mean that I don't appreciate looking at them in order to see what may have been the condition at one time or what might be present now.
We've seen many people run aground with their heads in cyber-space!