diff --git a/Strategic/Map Screen Helicopter.cpp b/Strategic/Map Screen Helicopter.cpp
index 5b2de161..d3d0b1e8 100644
--- a/Strategic/Map Screen Helicopter.cpp	
+++ b/Strategic/Map Screen Helicopter.cpp	
@@ -196,6 +196,9 @@ INT16 sRefuelSectorY[ MAX_NUMBER_OF_REFUEL_SITES ];
 
 BOOLEAN fRefuelingSiteHidden[ MAX_NUMBER_OF_REFUEL_SITES ];
 
+// heli tile index no in tileset
+INT32 iRefuelHeliTileIndex[ MAX_NUMBER_OF_REFUEL_SITES ];
+
 // heli graphics grid no
 INT32 iRefuelHeliGridNo[ MAX_NUMBER_OF_REFUEL_SITES ];
 // skyrider standing grid no
@@ -216,6 +219,7 @@ typedef enum
 	HELISITE_ELEMENT_REFUELSECTOR_X,
 	HELISITE_ELEMENT_REFUELSECTOR_Y,
 	HELISITE_ELEMENT_REFUEL_HIDDEN,
+	HELISITE_ELEMENT_REFUEL_HELI_TILE_INDEX,
 	HELISITE_ELEMENT_REFUEL_HELI_GRIDNO,
 	HELISITE_ELEMENT_REFUEL_SKYRIDER_GRIDNO,
 } HELISITE_PARSE_STAGE;
@@ -226,6 +230,7 @@ typedef struct
 	INT16	refuelSectorX;
 	INT16	refuelSectorY;
 	BOOLEAN	refuelHidden;
+	INT32	refuelHeliTileIndex;
 	INT32	refuelHeliGridNo;
 	INT32	refuelSkyriderGridNo;
 } heliInfo;
@@ -261,7 +266,8 @@ helisiteStartElementHandle(void *userData, const XML_Char *name, const XML_Char
 
 			memset( sRefuelSectorX,				0,	sizeof(sRefuelSectorX)			);
 			memset( sRefuelSectorY,				0,	sizeof(sRefuelSectorY)			);
-			memset( fRefuelingSiteHidden,			0,	sizeof(fRefuelingSiteHidden)		);
+			memset( fRefuelingSiteHidden,		0,	sizeof(fRefuelingSiteHidden)	);
+			memset( iRefuelHeliTileIndex,		0,	sizeof(iRefuelHeliTileIndex)	);
 			memset( iRefuelHeliGridNo,			0,	sizeof(iRefuelHeliGridNo)		);
 			memset( iRefuelSkyriderGridNo,		0,	sizeof(iRefuelSkyriderGridNo)	);
 
@@ -300,6 +306,11 @@ helisiteStartElementHandle(void *userData, const XML_Char *name, const XML_Char
 			pData->curElement = HELISITE_ELEMENT_REFUEL_HIDDEN;
 			pData->maxReadDepth++; //we are not skipping this element
 		}
+		else if(strcmp(name, "refuelHeliTileIndex") == 0 && pData->curElement == HELISITE_ELEMENT_REFUEL)
+		{
+			pData->curElement = HELISITE_ELEMENT_REFUEL_HELI_TILE_INDEX;
+			pData->maxReadDepth++; //we are not skipping this element
+		}
 		else if(strcmp(name, "refuelHeliGridNo") == 0 && pData->curElement == HELISITE_ELEMENT_REFUEL)
 		{
 			pData->curElement = HELISITE_ELEMENT_REFUEL_HELI_GRIDNO;
@@ -354,6 +365,7 @@ helisiteEndElementHandle(void *userData, const XML_Char *name)
 				sRefuelSectorX [ pData->curHeliInfo.uiIndex ]			= pData->curHeliInfo.refuelSectorX;
 				sRefuelSectorY [ pData->curHeliInfo.uiIndex ]			= pData->curHeliInfo.refuelSectorY;
 				fRefuelingSiteHidden [ pData->curHeliInfo.uiIndex ]		= pData->curHeliInfo.refuelHidden;
+				iRefuelHeliTileIndex [ pData->curHeliInfo.uiIndex ]		= pData->curHeliInfo.refuelHeliTileIndex;
 				iRefuelHeliGridNo [ pData->curHeliInfo.uiIndex ]		= pData->curHeliInfo.refuelHeliGridNo;
 				iRefuelSkyriderGridNo [ pData->curHeliInfo.uiIndex ]	= pData->curHeliInfo.refuelSkyriderGridNo;
 			}
@@ -394,6 +406,12 @@ helisiteEndElementHandle(void *userData, const XML_Char *name)
 
 			pData->curHeliInfo.refuelHidden = (BOOLEAN)atol(pData->szCharData);
 		}
+		else if(strcmp(name, "refuelHeliTileIndex") == 0 && pData->curElement == HELISITE_ELEMENT_REFUEL_HELI_TILE_INDEX )
+		{
+			pData->curElement = HELISITE_ELEMENT_REFUEL;
+
+			pData->curHeliInfo.refuelHeliTileIndex = atol(pData->szCharData);
+		}
 		else if(strcmp(name, "refuelHeliGridNo") == 0 && pData->curElement == HELISITE_ELEMENT_REFUEL_HELI_GRIDNO )
 		{
 			pData->curElement = HELISITE_ELEMENT_REFUEL;
@@ -504,6 +522,8 @@ BOOLEAN WriteInInfo(STR fileName)
 
 			FilePrintf(hFile,"\t\t\t<refuelHidden>%d</refuelHidden>\r\n", fRefuelingSiteHidden[cnt] );
 
+			FilePrintf(hFile,"\t\t\t<refuelHeliTileIndex>%d</refuelHeliTileIndex>\r\n", iRefuelHeliTileIndex[cnt] );
+
 			FilePrintf(hFile,"\t\t\t<refuelHeliGridNo>%d</refuelHeliGridNo>\r\n", iRefuelHeliGridNo[cnt] );
 
 			FilePrintf(hFile,"\t\t\t<refuelSkyriderGridNo>%d</refuelSkyriderGridNo>\r\n", iRefuelSkyriderGridNo[cnt] );
@@ -2263,74 +2283,75 @@ BOOLEAN CanHelicopterTakeOff( void )
 	return( FALSE );
 }
 
-void AddHeliPeice( INT32 sGridNo, UINT16 sOStruct )
+void AddHeliPiece( INT32 iGridNo, UINT16 sOStruct )
 {
 	UINT16 usDummy;
 
 	// ATE: Check first if already exists....
-	if ( !TypeExistsInStructLayer( sGridNo, sOStruct, &usDummy ) )
+	if ( !TypeExistsInStructLayer( iGridNo, sOStruct, &usDummy ) )
 	{
 		// place in the world
-		AddStructToTail( sGridNo, sOStruct );
+		AddStructToTail( iGridNo, sOStruct );
 	}
 }
 
 
 void AddHelicopterToMaps( BOOLEAN fAdd, UINT8 ubSite )
 {
- 	INT32 sGridNo = iRefuelHeliGridNo[ ubSite ];
-	INT16 sOStruct = 0;
+ 	INT32 iGridNo = iRefuelHeliGridNo[ ubSite ];
+	INT32 iTileIndexNo = iRefuelHeliTileIndex[ ubSite ];
+	//INT16 sOStruct = 0;
 	INT16	sGridX, sGridY;
 	INT16	sCentreGridX, sCentreGridY;
 
 	// find out what slot it is by which site
-	if( ubSite == 0 )
-	{
-		// drassen
-		sOStruct = FIRSTOSTRUCT1;
-	}
-	else
-	{
-		// estoni
-		sOStruct = FOURTHOSTRUCT1;
-	}
+	//if( ubSite == 0 )
+	//{
+	//	// drassen
+	//	sOStruct = FIRSTOSTRUCT1;
+	//}
+	//else
+	//{
+	//	// estoni
+	//	sOStruct = FOURTHOSTRUCT1;
+	//}
 
 
 	// are we adding or taking away
 	if( fAdd )
 	{
-		AddHeliPeice( sGridNo, sOStruct );
-		AddHeliPeice( sGridNo, ( UINT16 )( sOStruct + 1));
-		AddHeliPeice( ( sGridNo - 800 ), ( UINT16 )( sOStruct + 2 ));
-		AddHeliPeice( sGridNo, ( UINT16 )(sOStruct + 3 ));
-		AddHeliPeice( sGridNo, ( UINT16 )(sOStruct + 4));
-		AddHeliPeice( ( sGridNo - 800 ), ( UINT16 )(sOStruct + 5));
+		AddHeliPiece( iGridNo, ( UINT16 ) iTileIndexNo );	// AddHeliPiece( iGridNo, sOStruct );
+		AddHeliPiece( iGridNo, ( UINT16 )( iTileIndexNo + 1 ) );
+		AddHeliPiece( ( iGridNo - WORLD_ROWS * 5 ), ( UINT16 )( iTileIndexNo + 2 ) );	// ( iGridNo - 800 )
+		AddHeliPiece( iGridNo, ( UINT16 )( iTileIndexNo + 3 ) );
+		AddHeliPiece( iGridNo, ( UINT16 )( iTileIndexNo + 4 ) );
+		AddHeliPiece( ( iGridNo - WORLD_ROWS * 5 ), ( UINT16 )( iTileIndexNo + 5 ) );	// ( iGridNo - 800 )
 
 		InvalidateWorldRedundency();
 		SetRenderFlags( RENDER_FLAG_FULL );
 
 	// ATE: If any mercs here, bump them off!
-		ConvertGridNoToXY( sGridNo, &sCentreGridX, &sCentreGridY );
+		ConvertGridNoToXY( iGridNo, &sCentreGridX, &sCentreGridY );
 
 	for( sGridY = sCentreGridY - 5; sGridY < sCentreGridY + 5; sGridY++ )
 	{
 		for( sGridX = sCentreGridX - 5; sGridX < sCentreGridX + 5; sGridX++ )
 		{
-			sGridNo = MAPROWCOLTOPOS( sGridY, sGridX );
+			iGridNo = MAPROWCOLTOPOS( sGridY, sGridX );
 
-		 	BumpAnyExistingMerc( sGridNo );
+		 	BumpAnyExistingMerc( iGridNo );
 		}
 	}
 	}
 	else
 	{
 		// remove from the world
-		RemoveStruct( iRefuelHeliGridNo[ ubSite ], ( UINT16 )(sOStruct ));
-		RemoveStruct( iRefuelHeliGridNo[ ubSite ], ( UINT16 )(sOStruct + 1 ));
-		RemoveStruct( iRefuelHeliGridNo[ ubSite ] - 800, ( UINT16 )(sOStruct + 2));
-		RemoveStruct( iRefuelHeliGridNo[ ubSite ], ( UINT16 )(sOStruct + 3));
-		RemoveStruct( iRefuelHeliGridNo[ ubSite ], ( UINT16 )(sOStruct + 4));
-		RemoveStruct( iRefuelHeliGridNo[ ubSite ] - 800, ( UINT16 )(sOStruct +5));
+		RemoveStruct( iGridNo, ( UINT16 )iTileIndexNo );
+		RemoveStruct( iGridNo, ( UINT16 )( iTileIndexNo + 1 ) );
+		RemoveStruct( ( iGridNo - WORLD_ROWS * 5 ), ( UINT16 )( iTileIndexNo + 2 ) );	// ( iGridNo - 800 )
+		RemoveStruct( iGridNo, ( UINT16 )( iTileIndexNo + 3 ) );
+		RemoveStruct( iGridNo, ( UINT16 )( iTileIndexNo + 4 ) );
+		RemoveStruct( ( iGridNo - WORLD_ROWS * 5 ), ( UINT16 )( iTileIndexNo + 5 ) );	// ( iGridNo - 800 )
 
 		InvalidateWorldRedundency();
 		SetRenderFlags( RENDER_FLAG_FULL );
diff --git a/Strategic/Map Screen Helicopter.h b/Strategic/Map Screen Helicopter.h
index cc0b22bf..87a12441 100644
--- a/Strategic/Map Screen Helicopter.h	
+++ b/Strategic/Map Screen Helicopter.h	
@@ -128,6 +128,7 @@ extern BOOLEAN fShowCambriaHospitalHighLight;
 extern INT32 iTotalAccumulatedCostByPlayer;
 extern UINT32 guiTimeOfLastSkyriderMonologue;
 extern BOOLEAN fSkyRiderSetUp;
+extern UINT8 NUMBER_OF_REFUEL_SITES;
 extern BOOLEAN fRefuelingSiteAvailable[ MAX_NUMBER_OF_REFUEL_SITES ];
 extern BOOLEAN fRefuelingSiteHidden[ MAX_NUMBER_OF_REFUEL_SITES ];
 
diff --git a/Strategic/Map Screen Interface TownMine Info.cpp b/Strategic/Map Screen Interface TownMine Info.cpp
index f56da592..57d79f6f 100644
--- a/Strategic/Map Screen Interface TownMine Info.cpp	
+++ b/Strategic/Map Screen Interface TownMine Info.cpp	
@@ -701,52 +701,53 @@ void AddCommonInfoToBox(void)
 {
 	CHAR16 wString[ 64 ];
 	UINT32 hStringHandle = 0;
-	BOOLEAN fHiddenSite = FALSE;
+	BOOLEAN fKnownSite = FALSE;
 	UINT8 ubMilitiaTotal = 0;
 	UINT8 ubNumEnemies;
 	UINT16 usSectorValue = 0;
 
 	// get the sector value
-	usSectorValue = SECTOR( bCurrentTownMineSectorX, bCurrentTownMineSectorY );	
+	usSectorValue = SECTOR( bCurrentTownMineSectorX, bCurrentTownMineSectorY );
 
-	// check for hidden town
-	if( !gfHiddenTown[ GetTownIdForSector( bCurrentTownMineSectorX, bCurrentTownMineSectorY ) ] )
-		fHiddenSite = TRUE;
+	BOOLEAN fVisited = (SectorInfo[ usSectorValue ].uiFlags & SF_ALREADY_VISITED);
+	UINT8 ubTownId = GetTownIdForSector( bCurrentTownMineSectorX, bCurrentTownMineSectorY );
+
+	// visited sector check
+	if ( fVisited )
+		fKnownSite = TRUE;
+
+	// known town check, exclude TownId 0 for non-town sectors
+	else if( gfHiddenTown[ ubTownId ] && ubTownId != 0 )
+		fKnownSite = TRUE;
 	
-	// check for unknown SAM Site
+	// known SAM Site check
 	else
 	{
 		for (UINT16 x=0; x < MAX_NUMBER_OF_SAMS; x++)
 		{
-			// SAM Site 4 in Meduna is within town limits, so it's always known
-			if ( usSectorValue == SEC_N4 && x == 3)
-				fHiddenSite = FALSE;
-			
-			else if ( pSamList[x] == usSectorValue )
+			if ( pSamList[x] == usSectorValue )
 			{
-				if ( !fSamSiteFound[ x ] )
-				{
-					fHiddenSite = TRUE;
-				}
+				if ( fSamSiteFound[ x ] )
+					fKnownSite = TRUE;
 			}
 		}
 	}
 	
 	/*// ABOVE GROUND HARDCODED
-	if( ubSectorID == SEC_N4 && fSamSiteFound[ SAM_SITE_FOUR ] )
-	switch( SECTOR( bCurrentTownMineSectorX, bCurrentTownMineSectorY ) )
+	fKnownSite = TRUE;
+	switch( usSectorValue )
 	{
 		case SEC_D2: //Chitzena SAM
 			if( !fSamSiteFound[ SAM_SITE_ONE ] )
-				fHiddenSite = TRUE;
+				fKnownSite = FALSE;
 			break;
 		case SEC_D15: //Drassen SAM
 			if( !fSamSiteFound[ SAM_SITE_TWO ] )
-				fHiddenSite = TRUE;
+				fKnownSite = FALSE;
 			break;
 		case SEC_I8: //Cambria SAM
 			if( !fSamSiteFound[ SAM_SITE_THREE ] )
-				fHiddenSite = TRUE;
+				fKnownSite = FALSE;
 			break;
 		// SAM Site 4 in Meduna is within town limits, so it's always controllable
 		default:
@@ -756,7 +757,7 @@ void AddCommonInfoToBox(void)
 
 	// in sector where militia can be trained,
 	// control of the sector matters, display who controls this sector.	Map brightness no longer gives this!
-	if ( MilitiaTrainingAllowedInSector( bCurrentTownMineSectorX, bCurrentTownMineSectorY, 0 ) && !fHiddenSite )
+	if ( MilitiaTrainingAllowedInSector( bCurrentTownMineSectorX, bCurrentTownMineSectorY, 0 ) && fKnownSite )
 	{
 		// controlled:
 		swprintf( wString, L"%s:", pwMiscSectorStrings[ 4 ] );
@@ -799,7 +800,7 @@ void AddCommonInfoToBox(void)
 		// Sector contains Militia training facility?
 		for (UINT8 ubCounter = 0; ubCounter < MAX_NUM_FACILITY_TYPES; ubCounter++)
 		{
-			if (gFacilityLocations[SECTOR(bCurrentTownMineSectorX, bCurrentTownMineSectorY)][ubCounter].fFacilityHere)
+			if (gFacilityLocations[usSectorValue][ubCounter].fFacilityHere)
 			{
 				if (gFacilityTypes[ubCounter].ubMilitiaTrainersAllowed)
 				{
@@ -810,7 +811,7 @@ void AddCommonInfoToBox(void)
 		if (fMilitiaTrainingAllowed)
 		{
 			// Show percent completed
-			swprintf( wString, L"%d%%%%", SectorInfo[ SECTOR( bCurrentTownMineSectorX, bCurrentTownMineSectorY ) ].ubMilitiaTrainingPercentDone );
+			swprintf( wString, L"%d%%%%", SectorInfo[ usSectorValue ].ubMilitiaTrainingPercentDone );
 			AddSecondColumnMonoString( &hStringHandle, wString );
 		}
 		else
@@ -826,7 +827,7 @@ void AddCommonInfoToBox(void)
 		// Sector contains Mobile training facility?
 		for (UINT8 ubCounter = 0; ubCounter < MAX_NUM_FACILITY_TYPES; ubCounter++)
 		{
-			if (gFacilityLocations[SECTOR(bCurrentTownMineSectorX, bCurrentTownMineSectorY)][ubCounter].fFacilityHere)
+			if (gFacilityLocations[usSectorValue][ubCounter].fFacilityHere)
 			{
 				if (gFacilityTypes[ubCounter].ubMobileMilitiaTrainersAllowed)
 				{
@@ -838,7 +839,7 @@ void AddCommonInfoToBox(void)
 		if (fMobileTrainingAllowed)
 		{
 			// Show percentage completed
-			swprintf( wString, L"%d%%%%", SectorInfo[ SECTOR( bCurrentTownMineSectorX, bCurrentTownMineSectorY ) ].ubMobileMilitiaTrainingPercentDone );
+			swprintf( wString, L"%d%%%%", SectorInfo[ usSectorValue ].ubMobileMilitiaTrainingPercentDone );
 			AddSecondColumnMonoString( &hStringHandle, wString );
 		}
 		else