diff --git a/Moose Development/Moose/Core/Set.lua b/Moose Development/Moose/Core/Set.lua
index 7f863abf2..06981e95f 100644
--- a/Moose Development/Moose/Core/Set.lua	
+++ b/Moose Development/Moose/Core/Set.lua	
@@ -6691,6 +6691,8 @@ do -- SET_ZONE
   --          
   --          -- Stop watching after 1 hour
   --          zoneset:__TriggerStop(3600)
+  --          -- Call :SetPartlyInside() on any zone (or SET_ZONE) if you want GROUPs to count as inside when any of their units enters even if they are far apart.
+  --          -- Make sure to call :SetPartlyInside() before :Trigger()!.
   function SET_ZONE:Trigger(Objects)
     --self:I("Added Set_Zone Trigger")
     self:AddTransition("*","TriggerStart","TriggerRunning")
@@ -6741,6 +6743,20 @@ do -- SET_ZONE
     -- @param Core.Zone#ZONE_BASE Zone The zone left.
   end
   
+  --- Toggle “partly-inside” handling for every zone in the set when those zones are used with :Trigger().
+  -- * Call with no argument or **true** → enable for all.  
+  -- * Call with **false** → disable again (handy if it was enabled before).
+  -- @param #SET_ZONE self
+  -- @return #SET_ZONE self
+  function SET_ZONE:SetPartlyInside(state)
+    for _,Zone in pairs(self.Set) do
+        if Zone.SetPartlyInside then
+            Zone:SetPartlyInside(state)
+        end
+    end
+    return self
+  end
+  
   --- (Internal) Check the assigned objects for being in/out of the zone
   -- @param #SET_ZONE self
   -- @param #boolean fromstart If true, do the init of the objects
@@ -6776,8 +6792,13 @@ do -- SET_ZONE
               -- has not been tagged previously - wasn't in set! 
               obj.TriggerInZone[_zone.ZoneName] = false 
             end
-            -- is obj in zone?
-            local inzone = _zone:IsCoordinateInZone(obj:GetCoordinate())
+            -- is obj in this zone?
+            local inzone
+            if _zone.PartlyInside and obj.ClassName == "GROUP" then
+                inzone = obj:IsAnyInZone(_zone)                 -- TRUE as soon as any unit is inside
+            else
+                inzone = _zone:IsCoordinateInZone(obj:GetCoordinate())  -- original centroid test
+            end
             --self:I("Object "..obj:GetName().." is in zone: "..tostring(inzone))
             if inzone and not obj.TriggerInZone[_zone.ZoneName] then
               -- wasn't in zone before
diff --git a/Moose Development/Moose/Core/Zone.lua b/Moose Development/Moose/Core/Zone.lua
index 6ed990101..6b0ac3d32 100644
--- a/Moose Development/Moose/Core/Zone.lua	
+++ b/Moose Development/Moose/Core/Zone.lua	
@@ -70,6 +70,7 @@
 -- @field #table Table of any trigger zone properties from the ME. The key is the Name of the property, and the value is the property's Value.
 -- @field #number Surface Type of surface. Only determined at the center of the zone!
 -- @field #number Checktime Check every Checktime seconds, used for ZONE:Trigger()
+-- @field #boolean PartlyInside When called, a GROUP is considered inside as soon as any of its units enters the zone even if they are far apart.
 -- @extends Core.Fsm#FSM
 
 
@@ -612,6 +613,8 @@ end
 --
 --            -- Stop watching the zone after 1 hour
 --           triggerzone:__TriggerStop(3600)
+--            -- Call :SetPartlyInside() if you use SET_GROUP to count as inside when any of their units enters even when they are far apart.
+--            -- Make sure to call :SetPartlyInside() before :Trigger()!
 function ZONE_BASE:Trigger(Objects)
   --self:I("Added Zone Trigger")
   self:SetStartState("TriggerStopped")
@@ -680,6 +683,16 @@ function ZONE_BASE:Trigger(Objects)
   
 end
 
+  --- Toggle “partly-inside” handling for this zone. To be used before :Trigger().
+  -- * Default:* flag is **false** until you call the method.  
+  -- * Call with no argument or with **true** → enable.  
+  -- * Call with **false** → disable again (handy if it was enabled before).
+  -- @param #ZONE_BASE self
+  -- @return #ZONE_BASE self
+  function ZONE_BASE:SetPartlyInside(state)
+  self.PartlyInside = state or not ( state == false )
+  return self
+  end
 --- (Internal) Check the assigned objects for being in/out of the zone
 -- @param #ZONE_BASE self
 -- @param #boolean fromstart If true, do the init of the objects
@@ -718,7 +731,12 @@ function ZONE_BASE:_TriggerCheck(fromstart)
           obj.TriggerInZone[self.ZoneName] = false
         end
         -- is obj in zone?
-        local inzone = self:IsCoordinateInZone(obj:GetCoordinate())
+        local inzone
+        if self.PartlyInside and obj.ClassName == "GROUP" then
+            inzone = obj:IsAnyInZone(self)                     -- TRUE if any unit is inside
+        else
+            inzone = self:IsCoordinateInZone(obj:GetCoordinate()) -- original barycentre test
+        end
         --self:I("Object "..obj:GetName().." is in zone: "..tostring(inzone))
         if inzone and obj.TriggerInZone[self.ZoneName] then
           -- just count