Harvey, thank you for your message and great to hear that you are using
https://www.map.army.
I assume your custom map for war gaming is in an image format. In this case, please check the following video tutorial on how to add an image overlay
https://youtu.be/jV0iaUTjQlkHint:
https://www.map.army has a limitation for the image size to be uploaded as image overlays.
Should you run into this issue split your image overlay into two parts (left and right). Check the following thread for more information:
https://groups.google.com/g/militarymap/c/aXT0F2_H-3kPlease do not hesitate to contact us should you have further questions or feedback on the web application on
https://www.map.army.
Kind regards
Martin from the map.army team