How to add Maps to the map game?

[PatriceG]

Hello,
Thank you for this very cool project.
I installed it today. The automatic calibration if very cool.
I'd like to add new maps, especially maps for the Britany Islands (France).
What software did you use to get the maps and associated masks?
What is the recommended size for such a map?

I tried the games too. My daughter liked them very much :)