--- a/Outdoor.cpp	Thu May 01 12:59:50 2014 +0200
+++ b/Outdoor.cpp	Sun May 11 22:49:19 2014 +0200
@@ -2051,9 +2051,9 @@
   //v108 = (int)".odm";
   //v83 = strlen(pContainer);
   //strcpy((char *)v141 + v83, (const char *)v108);
-  memcpy(uUndiscoveredArea, pSrc, 0x3C8);
+  memcpy(uFullyRevealedCellOnMap, pSrc, 0x3C8);
   //v84 = (const void *)(v74 + 968);
-  memcpy(uDicovered_area, pSrc + 0x3C8, 0x3C8);
+  memcpy(uPartiallyRevealedCellOnMap, pSrc + 0x3C8, 0x3C8);
   pSrc += 2 * 0x3C8;
   //v85 = (char *)v84 + 968;
 
@@ -2061,8 +2061,8 @@
 
   if ( *(int *)thisa )
   {
-    memcpy(uUndiscoveredArea, Dst, 0x3C8u);
-    memcpy(uDicovered_area, Src, 0x3C8u);
+    memcpy(uFullyRevealedCellOnMap, Dst, 0x3C8u);
+    memcpy(uPartiallyRevealedCellOnMap, Src, 0x3C8u);
   }
 
   for (uint i = 0; i < uNumBModels; ++i)
@@ -2378,43 +2378,26 @@
 //----- (0047EF60) --------------------------------------------------------
 int OutdoorLocation::UpdateDiscoveredArea(int X_grid_pos, int Y_grid_poa, int a4)
 {
-  int v4; // ecx@1
-  int v5; // edx@2
-  int v6; // edi@2
-  int v9; // ebx@4
-  int v10; // eax@5
-//  int v12; // esi@12
-  char v13; // al@12
-  int v15; // [sp+4h] [bp-14h]@7
-
-  v4 = Y_grid_poa - 10;
-  if ( v4 < Y_grid_poa + 10 )
+  for (int i = -10; i < 10; i++)
   {
-    v5 = v4 - Y_grid_poa;
-    v6 = (Y_grid_poa - 30);
-    for ( int i = 0; i < Y_grid_poa + 10 - v4; i++)
+    int currYpos = Y_grid_poa + i - 20;
+    for (int j = -10; j < 10; j++)
     {
-      v9 = X_grid_pos - 10;
-      v10 = v9 - X_grid_pos;
-      for ( v9; v9 < X_grid_pos + 10; ++v9 )
+      int currXpos = X_grid_pos + j - 20;
+      int distanceSquared = i * i + j * j;
+      if ( distanceSquared <= 100 && currYpos >= 0 && currYpos <= 87 && currXpos >= 0 && currXpos <= 87 )
       {
-        v15 = abs(v10) * abs(v10) + abs(v5) * abs(v5);
-        if ( v15 <= 100 && v9 >= 20 && v9 <= 107 && v6 >= 0 && v6 <= 87 )
-        {
-          v13 = 1 << (7 - (v9 - 20) % 8);
-          this->uDicovered_area[v6][(v9 - 20)/8] |= v13;
-          if ( v15 <= 49 )
-            this->uUndiscoveredArea[v6][(v9 - 20)/8] |= v13;
-        }
-        ++v10;
+        unsigned char v13 = 1 << (7 - currXpos % 8);
+        this->uPartiallyRevealedCellOnMap[currYpos][currXpos / 8] |= v13;
+        if ( distanceSquared <= 49 )
+          this->uFullyRevealedCellOnMap[currYpos][currXpos / 8] |= v13;
       }
-      ++v6;
-      ++v5;
     }
   }
   return 1;
 }
 
+
 //----- (0047F04C) --------------------------------------------------------
 bool OutdoorLocation::_47F04C(signed int x_pos, signed int y_pos)
 {
@@ -2423,7 +2406,7 @@
   if ( x_pos < 0 || x_pos >= 88 || y_pos < 0 || y_pos >= 88 )
     result = 0;
   else
-    result = (uUndiscoveredArea[y_pos][x_pos/8] & (unsigned __int8)(1 << (7 - (x_pos) % 8))) != 0;
+    result = (uFullyRevealedCellOnMap[y_pos][x_pos/8] & (unsigned __int8)(1 << (7 - (x_pos) % 8))) != 0;
   return result;
 }
 
@@ -2435,7 +2418,7 @@
   if ( x_pos < 0 || x_pos >= 88 || y_pos < 0 || y_pos >= 88 )
     result = 0;
   else
-    result = (uDicovered_area[y_pos][x_pos/8] & (unsigned __int8)(1 << (7 - (x_pos) % 8))) != 0;
+    result = (uPartiallyRevealedCellOnMap[y_pos][x_pos/8] & (unsigned __int8)(1 << (7 - (x_pos) % 8))) != 0;
   return result;
 }
 

--- a/Outdoor.h	Thu May 01 12:59:50 2014 +0200
+++ b/Outdoor.h	Sun May 11 22:49:19 2014 +0200
@@ -200,8 +200,8 @@
   //int day_fogrange_1;
   //int day_fogrange_2;
  // char field_510[24];
-  unsigned char uUndiscoveredArea[88][11];//968
-  unsigned char uDicovered_area[88][11];//[968]
+  unsigned char uFullyRevealedCellOnMap[88][11];//968         the inner array is 11 bytes long, because every bit is used for a separate cell, so in the end it's 11 * 8 bits = 88 values
+  unsigned char uPartiallyRevealedCellOnMap[88][11];//[968]
   int field_CB8;
   int max_terrain_dimming_level;
   int field_CC0;

--- a/SaveLoad.cpp	Thu May 01 12:59:50 2014 +0200
+++ b/SaveLoad.cpp	Sun May 11 22:49:19 2014 +0200
@@ -426,9 +426,9 @@
       pOutdoor->ddm.uNumDecorations = uNumLevelDecorations;
       memcpy(data_write_pos, &pOutdoor->ddm, sizeof(DDM_DLV_Header));//0x28
       data_write_pos += sizeof(DDM_DLV_Header);
-      memcpy(data_write_pos, pOutdoor->uUndiscoveredArea, 0x3C8);
+      memcpy(data_write_pos, pOutdoor->uFullyRevealedCellOnMap, 0x3C8);
       data_write_pos += 968;
-      memcpy(data_write_pos, pOutdoor->uDicovered_area, 0x3C8);
+      memcpy(data_write_pos, pOutdoor->uPartiallyRevealedCellOnMap, 0x3C8);
       data_write_pos += 968;
       for (int i =  0; i < pOutdoor->uNumBModels ; ++i)  
         for (int j =  0; j < pOutdoor->pBModels[i].uNumFaces;++j)//*(int *)&pOutdoor->pBModels->pModelName[v24]; ++j)