re: Vostok
I know exactly where Vostok is
BUt - you said "It looks like Oppy might have to go down a hill or dip before it gets to Vostok. There seems to be a small somewhat circular valley where Vostok is. Notice the change in lighting/reflected light off the rims of the craters in Vostok's viscinity. The rims of the craters to the left reflect more light than those at the bottom right."
Now give there's something like 10 pixels between opportunity's current location and Vostok - how can you tell ANY of that?
Doug