You could add a circle for the tank u play most with the desired range (eg your suggested 223m) and have this always shown for "rule of thumb" (and maybe use an alpha of 50 or 60).
I believe it is possible in XVM config like minimapCircles.xc
just add line after "view": [
{ "enabled": true, "distance": 223, "scale": 1, "thickness": 0.7, "alpha": 45, "color": "0xFFCC66" },