diff --git a/src/O4_Config_Utils.py b/src/O4_Config_Utils.py
index d181be99..16d19a0e 100644
--- a/src/O4_Config_Utils.py
+++ b/src/O4_Config_Utils.py
@@ -267,10 +267,16 @@ def write_to_config(self, config_file = None):
             f = open(config_file, "w")
             for var in list_tile_vars:
                 tile_zones = []
+                lat = self.lat
+                lon = self.lon
+                if lat < 0:
+                    lat = lat + 1
+                if lon < 0:
+                    lon = lon + 1
                 for zone in globals()["zone_list"]:
                     _zone_list = [int(coord) for coord in zone[0]]
                     _zone_list = set(_zone_list)
-                    if self.lat in _zone_list and self.lon+1 in _zone_list:
+                    if lat in _zone_list and lon in _zone_list:
                         tile_zones.append(zone)
                         _LOGGER.debug("Zones in tile found: %s", tile_zones)
                 if var == "zone_list":
@@ -355,7 +361,7 @@ def tile_cfg_status(self, *args) -> None:
         if self.parent.tile_cfg_exists.get():
             self.tile_cfg_msg.set(
                 f"Tile configuration loaded for " \
-                f"{self.parent.lat.get()}{self.parent.lon.get()}"
+                f"{self.parent.lat.get()} {self.parent.lon.get()}"
             )
             state = "normal"
             for _, value in self.tile_entry_.items():
@@ -955,6 +961,10 @@ def reset_tile_cfg(self) -> None:
             return 0
         # Find all the zones for the active tile
         tile_zones = []
+        if lat < 0:
+            lat = lat + 1
+        if lon < 0:
+            lon = lon + 1
         for zone in globals()["zone_list"]:
             _zone_list = [int(coord) for coord in zone[0]]
             _zone_list = set(_zone_list)
@@ -1029,7 +1039,7 @@ def load_backup_tile_cfg(self) -> None:
                     pass
         # Apply changes to update global variables
         self.apply_changes("tile")
-        UI.vprint(0, f"Backup configuration loaded for tile at {lat}{lon}")
+        UI.vprint(0, f"Backup configuration loaded for tile at {lat} {lon}")
         f.close()
 
     def load_tile_cfg(self) -> None:
@@ -1081,7 +1091,7 @@ def load_tile_cfg(self) -> None:
         self.parent.tile_cfg_exists.set(True)
         # Apply changes to update global variables
         self.apply_changes("tile")
-        UI.vprint(0, f"Configuration loaded for tile at {lat}{lon}")
+        UI.vprint(0, f"Configuration loaded for tile at {lat} {lon}")
         f.close()
 
     def write_tile_cfg(self) -> None:
@@ -1115,10 +1125,14 @@ def write_tile_cfg(self) -> None:
             self.apply_changes("tile")
             # Get zones only for the tile
             tile_zones = []
+            if lat < 0:
+                lat = lat + 1
+            if lon < 0:
+                lon = lon + 1
             for zone in globals()["zone_list"]:
                 _zone_list = [int(coord) for coord in zone[0]]
                 _zone_list = set(_zone_list)
-                if lat in _zone_list and lon+1 in _zone_list:
+                if lat in _zone_list and lon in _zone_list:
                     tile_zones.append(zone)
                     _LOGGER.debug("Zones saved for tile at %s %s: %s", lat, lon, tile_zones)
             for var in list_tile_vars:
@@ -1128,7 +1142,7 @@ def write_tile_cfg(self) -> None:
                     f.write(var + "=" + self.v_[var].get() + "\n")
         self.load_tile_cfg()
         self.tile_cfg_status()
-        UI.vprint(1, f"Configuration saved for tile at {lat}{lon}")
+        UI.vprint(1, f"Configuration saved for tile at {lat} {lon}")
         return
 
     def reset_global_cfg(self) -> None:
diff --git a/src/O4_DEM_Utils.py b/src/O4_DEM_Utils.py
index 04cd8315..5ddaf29f 100755
--- a/src/O4_DEM_Utils.py
+++ b/src/O4_DEM_Utils.py
@@ -671,10 +671,25 @@ def ensure_elevation(source, lat, lon, verbose=True):
                 "P36",
                 "Q36",
                 "R36",
+                # New Zealand
+                "SL58",
+                "SI59",
+                "SJ59",
+                "SK59",
+                "SL59",
+                "SI60",
+                "SJ60",
+                "SK60",
+                "SL60",
             ):
                 resol = 1
             else:
                 resol = 3
+
+            # Wellington Intl has missing elevation data in 1" resolution
+            if (lat, lon) == (-42, 174):
+                resol = 3
+
             url = (
                 "http://viewfinderpanoramas.org/dem"
                 + str(resol)
diff --git a/src/O4_DSF_Utils.py b/src/O4_DSF_Utils.py
index 97806b7a..b0fdf003 100755
--- a/src/O4_DSF_Utils.py
+++ b/src/O4_DSF_Utils.py
@@ -364,6 +364,12 @@ def extract_elevation_and_bathymetry_data(lat, lon):
         "Earth nav data",
         FNAMES.long_latlon(lat, lon) + ".dsf",
     )
+    if not os.path.exists(global_scenery_dsf):
+        global_scenery_dsf = os.path.join(
+        OVL.custom_overlay_src_alternate,
+        "Earth nav data",
+        FNAMES.long_latlon(lat, lon) + ".dsf",
+        )
     if not os.path.exists(global_scenery_dsf):
         UI.exit_message_and_bottom_line(
             "   ERROR: file ",
diff --git a/src/O4_GUI_Utils.py b/src/O4_GUI_Utils.py
index 611c863b..fc31e84e 100755
--- a/src/O4_GUI_Utils.py
+++ b/src/O4_GUI_Utils.py
@@ -490,7 +490,7 @@ def load_tile_cfg(self, lat: int, lon: int) -> None:
                 self.default_website.set(CFG.default_website)
                 self.default_zl.set(CFG.default_zl)
             self.tile_cfg_exists.set(True)
-            UI.vprint(1, f"Configuration loaded for tile at {lat}{lon}")
+            UI.vprint(1, f"Configuration loaded for tile at {lat} {lon}")
             f.close()
         else:
             for var in list_global_tile_vars:
@@ -558,7 +558,21 @@ def get_lat_lon(self, check=True):
             return (48, -6)
         return (lat, lon)
 
-    def tile_from_interface(self):
+    def tile_from_interface(self) -> CFG.Tile | bool:
+        """
+        Create a Tile object for building a tile from the main window.
+
+        :return: Tile object or False
+        ;rtype: Tile object or False
+        """
+        # Check for unsaved changes
+        if (
+            self.config_window is not None
+            and self.config_window.winfo_exists()
+        ):
+            response = self.config_window.check_unsaved_changes()
+            if response == "cancel":
+                return False
         try:
             (lat, lon) = self.get_lat_lon()
             return CFG.Tile(lat, lon, str(self.custom_build_dir.get()))
@@ -568,7 +582,10 @@ def tile_from_interface(self):
     def build_poly_file(self):
         try:
             tile = self.tile_from_interface()
-            tile.make_dirs()
+            if tile:
+                tile.make_dirs()
+            else:
+                return
         except Exception as e:
             UI.vprint(1, "Process aborted.\n")
             _LOGGER.exception(e)
@@ -581,7 +598,10 @@ def build_poly_file(self):
     def build_mesh(self, event):
         try:
             tile = self.tile_from_interface()
-            tile.make_dirs()
+            if tile:
+                tile.make_dirs()
+            else:
+                return
         except Exception as e:
             UI.vprint(1, "Process aborted.\n")
             _LOGGER.exception("Exception on build_mesh")
@@ -594,7 +614,10 @@ def build_mesh(self, event):
     def sort_mesh(self, event):
         try:
             tile = self.tile_from_interface()
-            tile.make_dirs()
+            if tile:
+                tile.make_dirs()
+            else:
+                return
         except Exception as e:
             UI.vprint(1, "Process aborted.\n")
             _LOGGER.exception("Exception on sort_mesh")
@@ -607,7 +630,10 @@ def sort_mesh(self, event):
     def community_mesh(self, event):
         try:
             tile = self.tile_from_interface()
-            tile.make_dirs()
+            if tile:
+                tile.make_dirs()
+            else:
+                return
         except Exception as e:
             UI.vprint(1, "Process aborted.\n")
             _LOGGER.exception("Exception on community_mesh")
@@ -621,7 +647,10 @@ def build_masks(self, event):
         for_imagery = "Shift" in str(event) or "shift" in str(event)
         try:
             tile = self.tile_from_interface()
-            tile.make_dirs()
+            if tile:
+                tile.make_dirs()
+            else:
+                return
         except Exception as e:
             UI.vprint(1, "Process aborted.\n")
             _LOGGER.exception(e)
@@ -632,17 +661,12 @@ def build_masks(self, event):
         self.working_thread.start()
 
     def build_tile(self):
-        # Check for unsaved changes
-        if (
-            self.config_window is not None
-            and self.config_window.winfo_exists()
-        ):
-            response = self.config_window.check_unsaved_changes()
-            if response == "cancel":
-                return
         try:
             tile = self.tile_from_interface()
-            tile.make_dirs()
+            if tile:
+                tile.make_dirs()
+            else:
+                return
         except Exception as e:
             UI.vprint(1, "Process aborted.\n")
             _LOGGER.exception(e)
@@ -663,7 +687,10 @@ def build_all(self):
                 return
         try:
             tile = self.tile_from_interface()
-            tile.make_dirs()
+            if tile:
+                tile.make_dirs()
+            else:
+                return
         except Exception as e:
             UI.vprint(1, "Process aborted.\n")
             _LOGGER.exception(e)
diff --git a/src/O4_Overlay_Utils.py b/src/O4_Overlay_Utils.py
index c59f9e81..345041fe 100644
--- a/src/O4_Overlay_Utils.py
+++ b/src/O4_Overlay_Utils.py
@@ -205,7 +205,7 @@ def build_overlay(lat, lon):
     dest_dir = os.path.join(
         FNAMES.Overlay_dir, "Earth nav data", FNAMES.round_latlon(lat, lon)
     )
-    UI.vprint(1, "-> Coping the final overlay DSF in " + dest_dir)
+    UI.vprint(1, "-> Copying the final overlay DSF in " + dest_dir)
     if not os.path.exists(dest_dir):
         try:
             os.makedirs(dest_dir)
diff --git a/src/O4_Version.py b/src/O4_Version.py
index 778bc808..80242751 100755
--- a/src/O4_Version.py
+++ b/src/O4_Version.py
@@ -1 +1 @@
-version='1.40.03'
+version='1.40.04'