diff --git a/core/lookup_helper.py b/core/lookup_helper.py
index 31bcc72..1ecb8f6 100644
--- a/core/lookup_helper.py
+++ b/core/lookup_helper.py
@@ -416,7 +416,12 @@ class LookupHelper:
     # Infer a grid locator from a callsign (using DXCC, probably very inaccurate)
     def infer_grid_from_callsign_dxcc(self, call):
         latlon = self.infer_latlon_from_callsign_dxcc(call)
-        return latlong_to_locator(latlon[0], latlon[1], 8)
+        grid = None
+        try:
+            grid = latlong_to_locator(latlon[0], latlon[1], 8)
+        except:
+            logging.debug("Invalid lat/lon received for DXCC")
+        return grid
 
     # Infer a mode from the frequency (in Hz) according to the band plan. Just a guess really.
     def infer_mode_from_frequency(self, freq):
diff --git a/core/sig_utils.py b/core/sig_utils.py
index d712741..40b8432 100644
--- a/core/sig_utils.py
+++ b/core/sig_utils.py
@@ -73,9 +73,9 @@ def populate_sig_ref_info(sig_ref):
                 if row["reference"] == ref_id:
                     sig_ref.name = row["name"] if "name" in row else None
                     sig_ref.url = "https://wwff.co/directory/?showRef=" + ref_id
-                    sig_ref.grid = row["iaruLocator"] if "iaruLocator" in row else None
-                    sig_ref.latitude = float(row["latitude"]) if "latitude" in row else None
-                    sig_ref.longitude = float(row["longitude"]) if "longitude" in row else None
+                    sig_ref.grid = row["iaruLocator"] if "iaruLocator" in row and row["iaruLocator"] != "-" else None
+                    sig_ref.latitude = float(row["latitude"]) if "latitude" in row and row["latitude"] != "-" else None
+                    sig_ref.longitude = float(row["longitude"]) if "longitude" in row and row["longitude"] != "-" else None
                     break
         elif sig.upper() == "SIOTA":
             siota_csv_data = SEMI_STATIC_URL_DATA_CACHE.get("https://www.silosontheair.com/data/silos.csv",
@@ -112,9 +112,12 @@ def populate_sig_ref_info(sig_ref):
                     if asset["code"] == ref_id:
                         sig_ref.name = asset["name"]
                         sig_ref.url = "https://ontheair.nz/assets/ZLI_OT-030" + ref_id.replace("/", "_")
-                        sig_ref.grid = latlong_to_locator(asset["y"], asset["x"], 6)
-                        sig_ref.latitude = asset["y"]
-                        sig_ref.longitude = asset["x"]
+                        try:
+                            sig_ref.grid = latlong_to_locator(asset["y"], asset["x"], 6)
+                        except:
+                            logging.debug("Invalid lat/lon received for reference")
+                            sig_ref.latitude = asset["y"]
+                            sig_ref.longitude = asset["x"]
                         break
         elif sig.upper() == "BOTA":
             if not sig_ref.name:
@@ -124,9 +127,12 @@ def populate_sig_ref_info(sig_ref):
             ll = wab_wai_square_to_lat_lon(ref_id)
             if ll:
                 sig_ref.name = ref_id
-                sig_ref.grid = latlong_to_locator(ll[0], ll[1], 6)
-                sig_ref.latitude = ll[0]
-                sig_ref.longitude = ll[1]
+                try:
+                    sig_ref.grid = latlong_to_locator(ll[0], ll[1], 6)
+                    sig_ref.latitude = ll[0]
+                    sig_ref.longitude = ll[1]
+                except:
+                    logging.debug("Invalid lat/lon received for reference")
     except:
         logging.warn("Failed to look up sig_ref info for " + sig + " ref " + ref_id + ".")
     return sig_ref
diff --git a/data/spot.py b/data/spot.py
index 00de115..cfafdfa 100644
--- a/data/spot.py
+++ b/data/spot.py
@@ -284,9 +284,13 @@ class Spot:
 
         # DX Grid to lat/lon and vice versa in case one is missing
         if self.dx_grid and not self.dx_latitude:
-            ll = locator_to_latlong(self.dx_grid)
-            self.dx_latitude = ll[0]
-            self.dx_longitude = ll[1]
+            try:
+                print(json.dumps(self))
+                ll = locator_to_latlong(self.dx_grid)
+                self.dx_latitude = ll[0]
+                self.dx_longitude = ll[1]
+            except:
+                logging.debug("Invalid grid received for spot")
         if self.dx_latitude and self.dx_longitude and not self.dx_grid:
             try:
                 self.dx_grid = latlong_to_locator(self.dx_latitude, self.dx_longitude, 8)