Russian Tactical Markers - Addons - UO Community Forum
ArmA 3: Exile Mod - How To Place A 3D Marker! - YouTube
1Tac Wiki - tmf:orbat
Arma 3 on Twitter: "Hey there! If you're speaking of the gridded sections, those are area markers. You can create them in the Eden Editor, under the markers tab, on the map.
Map advanced markers - Miscellaneous - Armaholic
Steam Community :: Guide :: Graphic Control Measure (GCMs) for Arma III