diff --git a/addons/common/XEH_PREP.hpp b/addons/common/XEH_PREP.hpp
index f1726954595..db18cd12f16 100644
--- a/addons/common/XEH_PREP.hpp
+++ b/addons/common/XEH_PREP.hpp
@@ -81,6 +81,8 @@ PREP(getGunner);
 PREP(getInPosition);
 PREP(getItemReplacements);
 PREP(getLocalUnits);
+PREP(getMagneticBearing);
+PREP(getMagneticBearingOffset);
 PREP(getMapData);
 PREP(getMapGridData);
 PREP(getMapGridFromPos);
diff --git a/addons/common/functions/fnc_getMagneticBearing.sqf b/addons/common/functions/fnc_getMagneticBearing.sqf
new file mode 100644
index 00000000000..212dd96ecfe
--- /dev/null
+++ b/addons/common/functions/fnc_getMagneticBearing.sqf
@@ -0,0 +1,23 @@
+#include "..\script_component.hpp"
+/*
+ * Author: PabstMirror
+ * Returns magnetic heading (0..360)
+ *
+ * Arguments:
+ * 0: Object or Bearing <OBJECT><NUMBER> (default: ACE_player)
+ *
+ * Return Value:
+ * Compass Bearing <NUMBER>
+ *
+ * Example:
+ * [player] call ace_common_fnc_getMagneticBearing
+ *
+ * Public: Yes
+ */
+
+params [["_source", ACE_player, [objNull, 0]]];
+
+[
+    (if (_source isEqualType 0) then { _source } else { getDir _source })
+    + (missionNamespace getVariable [QGVAR(magneticDeclinationOffset), 0])
+] call CBA_fnc_simplifyAngle;
diff --git a/addons/common/functions/fnc_getMagneticBearingOffset.sqf b/addons/common/functions/fnc_getMagneticBearingOffset.sqf
new file mode 100644
index 00000000000..d070cbfb78b
--- /dev/null
+++ b/addons/common/functions/fnc_getMagneticBearingOffset.sqf
@@ -0,0 +1,152 @@
+#include "..\script_component.hpp"
+/*
+ * Author: PabstMirror
+ * Calculate magnetic offset based on lat/long
+ *
+ * Arguments:
+ * None
+ *
+ * Return Value:
+ * None
+ *
+ * Example:
+ * [] call ace_common_fnc_getMagneticBearingOffset
+ *
+ * Public: No
+ */
+
+TRACE_1("",GVAR(magneticDeclination));
+
+if (!GVAR(magneticDeclination)) exitWith {
+    if (!isNil QGVAR(magneticDeclinationOffset)) then { // was previously set
+        GVAR(magneticDeclinationOffset) = nil;
+        setCompassDeclination 0; // reset
+    };
+};
+
+private _long = GVAR(mapLongitude);
+private _lat = GVAR(mapLatitude);
+
+private _size = 5;
+private _data = [
+[148.667,141.133,128.969,110.073,85.876,63.866,48.485,38.446,31.613,26.636,22.794,19.716,17.209,15.167,13.526,12.242,11.272,10.563,10.046,9.638,9.243,8.766,8.135,7.315,6.331,5.256,4.192,3.232,2.424,1.754,1.146,0.468,-0.487,-2.091,-5.472,-22.385,-167.474],
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+[-81.333,-73.429,-67.675,-63.685,-60.941,-58.947,-57.263,-55.486,-53.218,-50.043,-45.563,-39.577,-32.350,-24.703,-17.653,-11.871,-7.507,-4.374,-2.181,-0.646,0.460,1.319,2.078,2.862,3.782,4.943,6.439,8.353,10.755,13.692,17.190,21.243,25.825,30.941,36.823,44.751,62.526],
+[-86.333,-78.368,-72.416,-68.144,-65.045,-62.619,-60.422,-58.060,-55.143,-51.281,-46.147,-39.677,-32.273,-24.769,-18.023,-12.521,-8.326,-5.255,-3.051,-1.470,-0.305,0.617,1.445,2.310,3.331,4.616,6.259,8.339,10.923,14.068,17.826,22.234,27.310,33.089,39.811,48.780,67.526],
+[-91.333,-83.363,-77.226,-72.644,-69.126,-66.174,-63.353,-60.281,-56.589,-51.928,-46.062,-39.073,-31.494,-24.150,-17.744,-12.587,-8.648,-5.728,-3.593,-2.030,-0.854,0.094,0.956,1.864,2.939,4.287,6.003,8.162,10.837,14.102,18.044,22.756,28.322,34.831,42.545,52.761,72.526],
+[-96.333,-88.415,-82.112,-77.195,-73.190,-69.613,-66.044,-62.123,-57.517,-51.941,-45.276,-37.764,-30.049,-22.916,-16.899,-12.146,-8.534,-5.844,-3.851,-2.365,-1.224,-0.284,0.583,1.501,2.583,3.934,5.642,7.787,10.450,13.730,17.758,22.699,28.735,36.048,44.947,56.682,77.526],
+[-101.333,-93.526,-87.084,-81.809,-77.252,-72.943,-68.487,-63.559,-57.884,-51.276,-43.770,-35.773,-28.006,-21.162,-15.593,-11.296,-8.070,-5.673,-3.886,-2.533,-1.470,-0.574,0.268,1.163,2.211,3.506,5.133,7.172,9.716,12.891,16.882,21.943,28.395,36.582,46.913,60.528,82.526],
+[-106.333,-98.700,-92.152,-86.506,-81.330,-76.173,-70.669,-64.549,-57.633,-49.884,-41.530,-33.140,-25.441,-18.977,-13.911,-10.107,-7.305,-5.247,-3.717,-2.549,-1.615,-0.806,-0.029,0.804,1.774,2.959,4.435,6.280,8.597,11.537,15.339,20.365,27.120,36.218,48.291,64.281,87.526],
+[-111.333,-103.938,-97.329,-91.311,-85.453,-79.316,-72.572,-65.037,-56.687,-47.708,-38.559,-29.920,-22.435,-16.438,-11.909,-8.612,-6.249,-4.556,-3.322,-2.387,-1.632,-0.964,-0.304,0.415,1.253,2.269,3.525,5.091,7.074,9.643,13.082,17.860,24.715,34.683,48.865,67.914,92.526],
+[-116.333,-109.242,-102.630,-96.254,-89.657,-82.391,-74.166,-64.938,-54.943,-44.692,-34.882,-26.201,-19.086,-13.630,-9.653,-6.854,-4.923,-3.600,-2.681,-2.016,-1.490,-1.019,-0.537,0.006,0.650,1.434,2.401,3.610,5.160,7.225,10.116,14.388,21.023,31.648,48.311,71.391,97.526],
+[-121.333,-114.615,-108.071,-101.374,-93.992,-85.418,-75.399,-64.122,-52.268,-40.799,-30.579,-22.119,-15.541,-10.689,-7.265,-4.940,-3.416,-2.448,-1.847,-1.469,-1.206,-0.978,-0.729,-0.422,-0.032,0.460,1.077,1.862,2.899,4.351,6.527,10.023,16.009,26.803,46.161,74.660,102.526],
+[-126.333,-120.057,-113.671,-106.719,-98.522,-88.427,-76.186,-62.399,-48.516,-36.049,-25.807,-17.881,-12.007,-7.815,-4.942,-3.064,-1.911,-1.267,-0.963,-0.867,-0.876,-0.914,-0.932,-0.900,-0.808,-0.653,-0.428,-0.108,0.371,1.148,2.505,5.011,9.895,20.038,41.772,77.643,107.526],
+[-131.333,-125.569,-119.447,-112.345,-103.338,-91.456,-76.383,-59.494,-43.555,-30.561,-20.802,-13.730,-8.707,-5.227,-2.907,-1.452,-0.635,-0.277,-0.234,-0.389,-0.650,-0.946,-1.232,-1.487,-1.708,-1.905,-2.082,-2.231,-2.307,-2.198,-1.672,-0.239,3.223,11.738,34.438,80.213,112.526],
+[-136.333,-131.150,-125.417,-118.321,-108.565,-94.563,-75.743,-55.026,-37.335,-24.561,-15.830,-9.877,-5.813,-3.079,-1.315,-0.271,0.236,0.346,0.173,-0.189,-0.659,-1.178,-1.706,-2.227,-2.746,-3.277,-3.832,-4.411,-4.984,-5.466,-5.678,-5.241,-3.260,2.927,23.905,82.158,117.526],
+[-141.333,-136.800,-131.599,-124.725,-114.380,-97.845,-73.817,-48.519,-29.966,-18.352,-11.107,-6.440,-3.380,-1.399,-0.188,0.456,0.671,0.563,0.212,-0.309,-0.940,-1.634,-2.360,-3.110,-3.887,-4.708,-5.586,-6.521,-7.490,-8.430,-9.212,-9.571,-8.871,-5.113,11.332,83.083,122.526],
+[-146.333,-142.514,-138.004,-131.648,-121.047,-101.479,-69.734,-39.521,-21.778,-12.232,-6.754,-3.416,-1.339,-0.083,0.600,0.863,0.806,0.503,0.006,-0.637,-1.389,-2.217,-3.102,-4.038,-5.029,-6.085,-7.213,-8.410,-9.654,-10.898,-12.057,-12.965,-13.219,-11.486,-0.691,82.184,127.526],
+[-151.333,-148.288,-144.642,-139.183,-128.953,-105.845,-61.693,-27.966,-13.286,-6.427,-2.785,-0.718,0.453,1.054,1.262,1.183,0.886,0.414,-0.204,-0.948,-1.798,-2.738,-3.758,-4.851,-6.017,-7.255,-8.563,-9.930,-11.333,-12.739,-14.101,-15.336,-16.218,-15.941,-10.016,77.586,132.526],
+[-156.333,-154.118,-151.509,-147.413,-138.659,-111.937,-46.094,-14.716,-5.053,-1.063,0.845,1.773,2.155,2.197,2.008,1.651,1.160,0.552,-0.167,-0.999,-1.941,-2.990,-4.137,-5.373,-6.688,-8.068,-9.499,-10.961,-12.432,-13.893,-15.331,-16.725,-17.981,-18.658,-16.167,64.445,137.526],
+[-161.333,-159.994,-158.596,-156.391,-150.901,-123.400,-19.343,-1.568,2.471,3.810,4.198,4.153,3.878,3.469,2.972,2.406,1.776,1.071,0.272,-0.637,-1.670,-2.829,-4.104,-5.477,-6.924,-8.417,-9.930,-11.436,-12.916,-14.365,-15.799,-17.245,-18.700,-19.967,-19.686,33.766,142.526],
+[-166.333,-165.908,-165.875,-166.105,-166.352,-163.756,9.995,9.785,9.035,8.181,7.313,6.467,5.661,4.898,4.170,3.460,2.739,1.973,1.122,0.152,-0.961,-2.223,-3.617,-5.115,-6.677,-8.262,-9.829,-11.350,-12.807,-14.210,-15.598,-17.034,-18.579,-20.193,-21.286,-2.315,147.526],
+[-171.333,-171.850,-173.309,-176.440,175.186,112.896,29.013,18.657,14.565,12.051,10.196,8.711,7.479,6.435,5.531,4.717,3.941,3.146,2.272,1.268,0.102,-1.236,-2.723,-4.320,-5.972,-7.624,-9.227,-10.745,-12.166,-13.510,-14.835,-16.229,-17.796,-19.603,-21.544,-20.488,152.526],
+[-176.333,-177.808,179.157,172.837,155.690,90.806,39.094,25.207,19.101,15.426,12.830,10.847,9.272,7.999,6.948,6.053,5.241,4.438,3.568,2.567,1.389,0.021,-1.516,-3.171,-4.879,-6.573,-8.193,-9.699,-11.080,-12.362,-13.617,-14.952,-16.500,-18.402,-20.868,-27.445,157.526],
+[178.667,176.232,171.586,162.055,137.998,82.523,44.416,29.897,22.736,18.310,15.189,12.828,10.981,9.514,8.335,7.367,6.527,5.732,4.892,3.930,2.786,1.438,-0.095,-1.762,-3.488,-5.197,-6.818,-8.304,-9.641,-10.861,-12.043,-13.308,-14.811,-16.744,-19.534,-29.724,162.526],
+[173.667,170.282,164.048,151.567,123.611,77.595,47.246,33.187,25.580,20.716,17.245,14.612,12.553,10.926,9.636,8.603,7.742,6.965,6.175,5.282,4.213,2.935,1.454,-0.179,-1.887,-3.584,-5.190,-6.647,-7.937,-9.093,-10.198,-11.384,-12.822,-14.744,-17.736,-29.884,167.526],
+[168.667,164.356,156.613,141.669,112.398,73.966,48.677,35.437,27.746,22.662,18.978,16.159,13.944,12.193,10.813,9.726,8.851,8.100,7.374,6.573,5.613,4.443,3.058,1.499,-0.158,-1.819,-3.391,-4.808,-6.043,-7.127,-8.150,-9.249,-10.607,-12.490,-15.609,-28.988,172.526],
+[163.667,158.467,149.342,132.543,103.622,70.983,49.264,36.915,29.340,24.181,20.381,17.442,15.119,13.274,11.822,10.692,9.809,9.088,8.432,7.737,6.909,5.881,4.630,3.184,1.615,0.022,-1.494,-2.851,-4.017,-5.021,-5.954,-6.957,-8.224,-10.048,-13.250,-27.552,177.526],
+[158.667,152.626,142.289,124.257,96.589,68.380,49.316,37.818,30.458,25.314,21.463,18.451,16.051,14.133,12.621,11.449,10.554,9.858,9.269,8.684,8.003,7.145,6.067,4.780,3.345,1.861,0.439,-0.830,-1.906,-2.817,-3.650,-4.551,-5.719,-7.473,-10.737,-25.858,-177.474],
+[153.667,146.845,135.490,116.790,90.789,66.030,49.017,38.291,31.189,26.114,22.253,19.198,16.738,14.757,13.183,11.963,11.042,10.352,9.813,9.329,8.798,8.128,7.260,6.182,4.940,3.625,2.350,1.211,0.251,-0.549,-1.274,-2.066,-3.129,-4.808,-8.127,-24.091,-172.474]
+];
+
+// Bilinear interpolation
+private _x = (_long + 180) / _size;
+private _x1 = floor _x;
+private _x2 = (_x1 + 1) % (360 / _size);
+_x = _x % 1;
+
+private _y = (_lat + 90) / _size;
+private _y1 = floor _y;
+private _y2 = (_y1 + 1) % (180 / _size);
+_y = _y % 1;
+
+private _q11 = (1-_x) * (1-_y) * (_data # _x1 # _y1);
+private _q12 = (1-_x) * _y * (_data # _x1 # _y2);
+private _q21 = _x * (1-_y) * (_data # _x2 # _y1);
+private _q22 = _x * _y * (_data # _x2 # _y2);
+
+GVAR(magneticDeclinationOffset) = _q11 + _q12 + _q21 + _q22;
+setCompassDeclination rad GVAR(magneticDeclinationOffset);
+
+
+/*
+Table generated with https://github.com/cmweiss/geomag
+gm = GeoMag("WMM.COF")
+size = 5
+whole = "["
+whole_first = True
+for x in range(-180, 180, size):
+    if (whole_first):
+        whole_first = False
+    else:
+        whole += ","
+    line = "\n["
+    line_first = True
+    for y in range(-90, 90+size, size):
+        if (line_first):
+            line_first = False
+        else:
+            line += ","
+        mag = gm.GeoMag(y,x)
+        line += f"{mag.dec:.3f}" #f"[{x}, {y}]"
+    line += "]"
+    whole += line
+whole += "\n]"
+print(f"--- START ---")
+print(f"{whole}")
+print(f"--- END ---")
+*/
diff --git a/addons/common/initSettings.inc.sqf b/addons/common/initSettings.inc.sqf
index a784ac64a95..4b3a2fd9c9d 100644
--- a/addons/common/initSettings.inc.sqf
+++ b/addons/common/initSettings.inc.sqf
@@ -102,6 +102,16 @@ private _categorySway = [_category, LSTRING(subcategory_sway)];
     0
 ] call CBA_fnc_addSetting;
 
+[
+    QGVAR(magneticDeclination),
+    "CHECKBOX",
+    [LSTRING(magneticDeclination), LSTRING(magneticDeclinationooltip)],
+    _category,
+    false,
+    1,
+    {call FUNC(getMagneticBearingOffset)}
+] call CBA_fnc_addSetting;
+
 [
     QGVAR(enableSway),
     "CHECKBOX",
diff --git a/addons/common/stringtable.xml b/addons/common/stringtable.xml
index bd8c977d6fc..884f436dc45 100644
--- a/addons/common/stringtable.xml
+++ b/addons/common/stringtable.xml
@@ -1793,6 +1793,12 @@
             <Chinesesimp>装载</Chinesesimp>
             <Turkish>Yükle</Turkish>
         </Key>
+        <Key ID="STR_ACE_Common_magneticDeclination">
+            <English>Realistic Compass Declination</English>
+        </Key>
+        <Key ID="STR_ACE_Common_magneticDeclinationooltip">
+            <English>Compass will point to magnetic north</English>
+        </Key>
         <Key ID="STR_ACE_Common_playerOnly">
             <English>Players only</English>
             <Czech>Pouze hráči</Czech>
diff --git a/addons/maptools/functions/fnc_openMapGpsUpdate.sqf b/addons/maptools/functions/fnc_openMapGpsUpdate.sqf
index 6d184366255..b048e591387 100644
--- a/addons/maptools/functions/fnc_openMapGpsUpdate.sqf
+++ b/addons/maptools/functions/fnc_openMapGpsUpdate.sqf
@@ -30,7 +30,7 @@ if (CBA_missionTime < GVAR(mapGpsNextUpdate)) exitWith {};
 GVAR(mapGpsNextUpdate) = CBA_missionTime + 0.5;
 
 private _ctrl = _mapDisplay displayCtrl 913590;
-_ctrl ctrlSetText str (round (getDir ACE_player));  // Set Heading
+_ctrl ctrlSetText str (round ([ACE_player] call EFUNC(common,getMagneticBearing)));  // Set Heading
 
 _ctrl = _mapDisplay displayCtrl 913591;
 _ctrl ctrlSetText str (round ((getPosASL ACE_player) select 2) + EGVAR(common,mapAltitude)); // Set Altitude