diff --git a/swad_centre.c b/swad_centre.c
index 79cd4691..72449251 100644
--- a/swad_centre.c
+++ b/swad_centre.c
@@ -743,25 +743,13 @@ static void Ctr_GetDataOfCentreFromRow (struct Centre *Ctr,MYSQL_ROW row)
    Ctr->RequesterUsrCod = Str_ConvertStrCodToLongCod (row[4]);
 
    /***** Get latitude (row[5]) *****/
-   Ctr->Coord.Latitude = Str_GetDoubleFromStr (row[5]);
-   if (Ctr->Coord.Latitude < -90.0)
-      Ctr->Coord.Latitude = -90.0;	// South Pole
-   else if (Ctr->Coord.Latitude > 90.0)
-      Ctr->Coord.Latitude = 90.0;		// North Pole
+   Ctr->Coord.Latitude = Map_GetLatitudeFromStr (row[5]);
 
    /***** Get longitude (row[6]) *****/
-   Ctr->Coord.Longitude = Str_GetDoubleFromStr (row[6]);
-   if (Ctr->Coord.Longitude < -180.0)
-      Ctr->Coord.Longitude = -180.0;	// West
-   else if (Ctr->Coord.Longitude > 180.0)
-      Ctr->Coord.Longitude = 180.0;	// East
+   Ctr->Coord.Longitude = Map_GetLongitudeFromStr (row[6]);
 
    /***** Get altitude (row[7]) *****/
-   Ctr->Coord.Altitude = Str_GetDoubleFromStr (row[7]);
-   if (Ctr->Coord.Altitude < -413.0)
-      Ctr->Coord.Altitude = -413.0;	// Dead Sea shore
-   else if (Ctr->Coord.Altitude > 8848.0)
-      Ctr->Coord.Altitude = 8848.0;	// Mount Everest
+   Ctr->Coord.Altitude = Map_GetAltitudeFromStr (row[7]);
 
    /***** Get the short name of the centre (row[8]) *****/
    Str_Copy (Ctr->ShrtName,row[8],
diff --git a/swad_centre_config.c b/swad_centre_config.c
index a5220f5b..daf3ec8d 100644
--- a/swad_centre_config.c
+++ b/swad_centre_config.c
@@ -1158,11 +1158,7 @@ void CtrCfg_ChangeCtrLatitude (void)
 
    /***** Get latitude *****/
    Par_GetParToText ("Latitude",LatitudeStr,sizeof (LatitudeStr) - 1);
-   NewLatitude = Str_GetDoubleFromStr (LatitudeStr);
-   if (NewLatitude < -90.0)
-      NewLatitude = -90.0;	// South Pole
-   else if (NewLatitude > 90.0)
-      NewLatitude = 90.0;	// North Pole
+   NewLatitude = Map_GetLatitudeFromStr (LatitudeStr);
 
    /***** Update database changing old latitude by new latitude *****/
    CtrCfg_UpdateCtrCoordinateDB (Gbl.Hierarchy.Ctr.CtrCod,"Latitude",NewLatitude);
@@ -1187,11 +1183,7 @@ void CtrCfg_ChangeCtrLongitude (void)
 
    /***** Get longitude *****/
    Par_GetParToText ("Longitude",LongitudeStr,sizeof (LongitudeStr) - 1);
-   NewLongitude = Str_GetDoubleFromStr (LongitudeStr);
-   if (NewLongitude < -180.0)
-      NewLongitude = -180.0;	// West
-   else if (NewLongitude > 180.0)
-      NewLongitude = 180.0;	// East
+   NewLongitude = Map_GetLongitudeFromStr (LongitudeStr);
 
    /***** Update database changing old longitude by new longitude *****/
    CtrCfg_UpdateCtrCoordinateDB (Gbl.Hierarchy.Ctr.CtrCod,"Longitude",NewLongitude);
@@ -1216,11 +1208,7 @@ void CtrCfg_ChangeCtrAltitude (void)
 
    /***** Get altitude *****/
    Par_GetParToText ("Altitude",AltitudeStr,sizeof (AltitudeStr) - 1);
-   NewAltitude = Str_GetDoubleFromStr (AltitudeStr);
-   if (NewAltitude < -413.0)
-      NewAltitude = -413.0;	// Dead Sea shore
-   else if (NewAltitude > 8848.0)
-      NewAltitude = 8848.0;	// Mount Everest
+   NewAltitude = Map_GetAltitudeFromStr (AltitudeStr);
 
    /***** Update database changing old altitude by new altitude *****/
    CtrCfg_UpdateCtrCoordinateDB (Gbl.Hierarchy.Ctr.CtrCod,"Altitude",NewAltitude);
diff --git a/swad_changelog.h b/swad_changelog.h
index 59e51b50..649fbcef 100644
--- a/swad_changelog.h
+++ b/swad_changelog.h
@@ -492,7 +492,7 @@ enscript -2 --landscape --color --file-align=2 --highlight --line-numbers -o - *
 En OpenSWAD:
 ps2pdf source.ps destination.pdf
 */
-#define Log_PLATFORM_VERSION	"SWAD 19.111.2 (2020-01-03)"
+#define Log_PLATFORM_VERSION	"SWAD 19.111.3 (2020-01-03)"
 #define CSS_FILE		"swad19.111.css"
 #define JS_FILE			"swad19.91.1.js"
 /*
@@ -501,6 +501,7 @@ ps2pdf source.ps destination.pdf
 // TODO: No se puede entrar con DNI '1' suponiendo que no tenga password ¿por qué?
 // TODO: Version 19.1xx:   Jan xx, 2020	Map in institution information. (? lines)
 
+	Version 19.111.3: Jan 03, 2020	Code refactoring in maps. (278251 lines)
 	Version 19.111.2: Jan 03, 2020	Map in institution information. (278231 lines)
 	Version 19.111.1: Jan 03, 2020	Map in institution information. (278215 lines)
 	Version 19.111:   Jan 03, 2020	Map in institution information. (278208 lines)
diff --git a/swad_institution_config.c b/swad_institution_config.c
index f6e309a7..89f73da6 100644
--- a/swad_institution_config.c
+++ b/swad_institution_config.c
@@ -280,18 +280,10 @@ static void InsCfg_GetCoordAndZoom (struct Coordinates *Coord,unsigned *Zoom)
       row = mysql_fetch_row (mysql_res);
 
       /* Get latitude (row[0]) */
-      Coord->Latitude = Str_GetDoubleFromStr (row[0]);
-      if (Coord->Latitude < -90.0)
-	 Coord->Latitude = -90.0;	// South Pole
-      else if (Coord->Latitude > 90.0)
-	 Coord->Latitude = 90.0;	// North Pole
+      Coord->Latitude = Map_GetLatitudeFromStr (row[0]);
 
       /* Get longitude (row[1]) */
-      Coord->Longitude = Str_GetDoubleFromStr (row[1]);
-      if (Coord->Longitude < -180.0)
-	 Coord->Longitude = -180.0;	// West
-      else if (Coord->Longitude > 180.0)
-	 Coord->Longitude = 180.0;	// East
+      Coord->Longitude = Map_GetLongitudeFromStr (row[1]);
 
       /* Get maximum distance (row[2]) */
       MaxDistance = Str_GetDoubleFromStr (row[2]);
@@ -302,12 +294,7 @@ static void InsCfg_GetCoordAndZoom (struct Coordinates *Coord,unsigned *Zoom)
       MaxDistance      = 0.0;
 
    /***** Convert distance to zoom *****/
-   *Zoom =  (MaxDistance <   0.01) ? 16 :
-           ((MaxDistance <   0.1 ) ? 12 :
-           ((MaxDistance <   1.0 ) ?  8 :
-           ((MaxDistance <  10.0 ) ?  6 :
-           ((MaxDistance < 100.0 ) ?  3 :
-                                      1))));
+   *Zoom = Map_GetZoomFromDistance (MaxDistance);
 
    /***** Free structure that stores the query result *****/
    DB_FreeMySQLResult (&mysql_res);
diff --git a/swad_map.c b/swad_map.c
index f5f61e89..4ca182be 100644
--- a/swad_map.c
+++ b/swad_map.c
@@ -164,3 +164,66 @@ void Map_AddPopup (const char *Title,const char *Subtitle,bool Open)
       HTM_Txt (".openPopup()");
    HTM_Txt (";\n");
   }
+
+/*****************************************************************************/
+/************************ Get latitude from a string *************************/
+/*****************************************************************************/
+// This function may change Str on wrong double
+
+double Map_GetLatitudeFromStr (char *Str)
+  {
+   double Latitude = Str_GetDoubleFromStr (Str);
+
+   if (Latitude < -90.0)
+      return -90.0;	// South Pole
+   if (Latitude > 90.0)
+      return 90.0;	// North Pole
+   return Latitude;
+  }
+
+/*****************************************************************************/
+/*********************** Get longitude from a string *************************/
+/*****************************************************************************/
+// This function may change Str on wrong double
+
+double Map_GetLongitudeFromStr (char *Str)
+  {
+   double Longitude = Str_GetDoubleFromStr (Str);
+
+   if (Longitude < -180.0)
+      return -180.0;	// West
+   if (Longitude > 180.0)
+      return 180.0;	// East
+   return Longitude;
+  }
+
+/*****************************************************************************/
+/************************ Get altitude from a string *************************/
+/*****************************************************************************/
+// This function may change Str on wrong double
+
+double Map_GetAltitudeFromStr (char *Str)
+  {
+   double Altitude = Str_GetDoubleFromStr (Str);
+
+   if (Altitude < -413.0)
+      return -413.0;	// Dead Sea shore
+   if (Altitude > 8848.0)
+      return 8848.0;	// Mount Everest
+   return Altitude;
+  }
+
+/*****************************************************************************/
+/*********************** Get zoom level from distance ************************/
+/*****************************************************************************/
+
+unsigned Map_GetZoomFromDistance (double MaxDistance)
+  {
+   /***** Convert distance to zoom *****/
+   return (MaxDistance <   0.01) ? 16 :
+         ((MaxDistance <   0.1 ) ? 12 :
+         ((MaxDistance <   1.0 ) ?  8 :
+         ((MaxDistance <  10.0 ) ?  6 :
+         ((MaxDistance < 100.0 ) ?  3 :
+                                    1))));
+  }
diff --git a/swad_map.h b/swad_map.h
index c1ffcaad..06da7271 100644
--- a/swad_map.h
+++ b/swad_map.h
@@ -50,4 +50,9 @@ void Map_AddTileLayer (void);
 void Map_AddMarker (const struct Coordinates *Coord);
 void Map_AddPopup (const char *Title,const char *Subtitle,bool Open);
 
+double Map_GetLatitudeFromStr (char *Str);
+double Map_GetLongitudeFromStr (char *Str);
+double Map_GetAltitudeFromStr (char *Str);
+unsigned Map_GetZoomFromDistance (double MaxDistance);
+
 #endif