diff --git a/addons/common/functions/fnc_getMapGridData.sqf b/addons/common/functions/fnc_getMapGridData.sqf
index e542c9d818..308772bfff 100644
--- a/addons/common/functions/fnc_getMapGridData.sqf
+++ b/addons/common/functions/fnc_getMapGridData.sqf
@@ -47,8 +47,17 @@ if (_letterGrid) exitWith {
     diag_log text format ["[ACE] Map Grid Warning (%1) - Map uses letter grids [%2,%3]", worldName, _formatX, _formatY];
 };
 
+//Start at [0, 500] and move north until we get a change in grid
+_heightOffset = 500;
+_startGrid = mapGridPosition [0, _heightOffset];
+_originGrid = _startGrid;
+while {_startGrid == _originGrid} do {
+    _heightOffset = _heightOffset + 1;
+    _originGrid = mapGridPosition [0, _heightOffset];
+};
+
 //Calculate the real y offset
-_realOffsetY = worldSize - _stepY - 1;
+_realOffsetY = parseNumber (_originGrid select [(count _formatX), (count _formatY)]) * _stepY + _heightOffset - 1;
 
 //Calculate MGRS 10digit step - they should both be 1 meter:
 _stepXat5 = _stepX * 10 ^ ((count _formatX) - 5);