I saw a map of Mars landing sites, which I can't find anymore. The bulk were on a tiny sliver next to a mountain, and most landers were immobile. We've only had

I saw a map of Mars landing sites, which I can't find anymore. The bulk were on a tiny sliver next to a mountain, and most landers were immobile. We've only had a good, constantly up to date map of Mars for a handful of years thanks to MRO. It takes time to plan new missions based on that data.