Regarding Mars, this seems to happen a lot. It appears there are areas we are allowed to see and areas we are not.
In the argot of space exploration, it's the GGG - Great Galactic Ghoul.
It appears there are areas we are allowed to see and areas we are not.
From looking at the probable landing area yesterday, it was almost on top of the current location of the Opportunity rover.
Not that they were trying to hit it, but were off course down and to the right of the nearest of the four desired landing choices.
I wasn't impressed on where they were trying to land. From strictly a scatter diagram, they were trying to put it in a somewhat "congested" area, but they were taking terrain into consideration.