buildable mission updates

src/classes/util/DcsUtil.lua

@@ -632,13 +632,19 @@ do     -- INIT DCS_UTIL
     ---@field b number
     ---@field a number
 
+    
+    local customDrawingIdIncrementer = 4210
+    function DCS_UTIL.GetNextDrawID()
+        customDrawingIdIncrementer = customDrawingIdIncrementer + 1
+        return customDrawingIdIncrementer
+    end
 
     ---@param groupID number
     ---@param text string
     ---@param location Vec3
     ---@return number markID
     function DCS_UTIL.AddMarkToGroup(groupID, text, location)
-        drawID = drawID + 1
+        local drawID = DCS_UTIL.GetNextDrawID()
         trigger.action.markToGroup(drawID, text, location, groupID, true, nil)
         return drawID
     end
@@ -648,7 +654,7 @@ do     -- INIT DCS_UTIL
     ---@param location Vec3
     ---@return integer
     function DCS_UTIL.AddMarkToAll(text, location)
-        drawID = drawID + 1
+        local drawID = DCS_UTIL.GetNextDrawID()
         trigger.action.markToAll(drawID, text, location, true, nil)
         return drawID
     end