I subscribed to Science of Solar System course from Coursera. During the lectures on water on Mars, the instructor showed us the map of water distribution in Martian regolith and map of remnant magnetism of Martian crust. I was curious how it would look on spherical projection so I made an addon to Celestia turning 2D map into 3D view. Please find the addon attached in ZIP file. You need to unpack it into Celestia’s “extras” subfolder.