How could we, users aid to update the mod into the 1.17.x ?

@KhanterWinters FWIW, I've made a 1.17.1 port, available in https://github.com/magicus/JustMap/tree/1.17.1. If you know how to compile and build the mod yourself, feel free to try it out, and report any bugs to me. (Known issue right now is that grid lines do not work).

By porting it to 1.17 and then making a pull request. There's an old 1.17 branch already, could start there.

I haven't enought time at this moment for making 1.17 version.

@Bulldog83 unfortunately does not seem very active in the project currently. :-(

I have decided to publish a binary build of my 1.17.1 version of the mod. It is available here:
https://github.com/magicus/JustMap/releases/tag/1.2.28-1.17.1-magicus-release