1. Download the Server Grid Editor (SGE) from here:
2. unzip then run the SGE (preferred as administrator)
3. "Load Project" and choose the standard servergrid.json (with the date 2021.04.26. - thats the new map. you can select the old ones too, or make a completly new one)
4. You can now see the world map and the 11x11 grid. Choose the export menu and click on "all". This will export everyting, big servermap, the servergrid.json file and the small grid maps.
5. The process will use almost 99-100% of your cpu, so make sure you dont wanna do anything else in the next 20-30ish minutes.
6. Now, you will have 121+ file in the destination directory, with .png extension, thats are the maps/grids (usually in the export folder) (for example: CellImg_X-Y.png (grid maps) and MapImg.png (world map))
7. Make sure, you do backup of your \steamapps\common\ATLAS\ShooterGame\Saved\ first!!!!!
8. Then copy the exported servergid folder into the Atlas\shootergame\Saved folder.
9. Copy the servergrid.json too, from the SGE directory to the Atlas\shooter\saved too (replace the old one there, but again make a backup first)
Thats all.
At this moment the taming in non-dedicated host and singleplayer is broken, with several another feature, so prepare for that.
sidenote: in the SGE you can customize the word map, if you check the tradewinds, or grid lines or discovery zones, anything. Every extra visual you turn on in SGE, is what you will get in the servermap after the export.
(sorry for my english, its not my native language, but i hope you can understand at least a little bit)