Not sure if it's just because I didn't find it or it indeed doesn't exist in the game, but I find it will be helpful if the 1km grid can be numbered when you overlay that on the map, i.e. I can point to one grid cell and say my xxx infantry regiment is at M6, or F12, etc. While you can use the closest landmark (e.g. a village etc) to refer to the location of a unit, a numbering system (or should I call it coordinates?) would make it much easier.