diff --git a/at_commands.py b/at_commands.py
index 704906f..82955a9 100644
--- a/at_commands.py
+++ b/at_commands.py
@@ -49,7 +49,7 @@ def get_modem_cops(port="/dev/ttyUSB2", baudrate=115200, dictionary={}):
 
     except Exception as e:
         dictionary["cops error"] = f"{e}"
-    
+
     return dictionary
 
 
@@ -79,7 +79,7 @@ def get_modem_creg(port="/dev/ttyUSB2", baudrate=115200, dictionary={}):
 
     except Exception as e:
         dictionary["creg error"] = f"{e}"
-    
+
     return dictionary
 
 
@@ -110,7 +110,7 @@ def get_modem_csq(port="/dev/ttyUSB2", baudrate=115200, dictionary={}):
 
     except Exception as e:
         dictionary["csq error"] = f"{e}"
-    
+
     return dictionary
 
 
@@ -150,7 +150,7 @@ def get_modem_rsrp(port="/dev/ttyUSB2", baudrate=115200, dictionary={}):
 
     except Exception as e:
         dictionary["qrsrp error"] = f"{e}"
-    
+
     return dictionary
 
 
@@ -190,7 +190,7 @@ def get_modem_rsrq(port="/dev/ttyUSB2", baudrate=115200, dictionary={}):
 
     except Exception as e:
         dictionary["qrsrq error"] = f"{e}"
-    
+
     return dictionary
 
 
@@ -229,7 +229,7 @@ def get_modem_sinr(port="/dev/ttyUSB2", baudrate=115200, dictionary={}):
 
     except Exception as e:
         dictionary["qsinr error"] = f"{e}"
-    
+
     return dictionary
 
 
@@ -271,7 +271,7 @@ def get_modem_cpol(port="/dev/ttyUSB2", baudrate=115200, dictionary={}):
 
     except Exception as e:
         dictionary["cpol error"] = f"{e}"
-    
+
     return dictionary
 
 
@@ -310,7 +310,7 @@ def get_modem_qnwcfg(port="/dev/ttyUSB2", baudrate=115200, dictionary={}):
 
     except Exception as e:
         dictionary["qnwcfg error"] = f"{e}"
-    
+
     return dictionary
 
 
@@ -338,7 +338,7 @@ def get_modem_qnwinfo(port="/dev/ttyUSB2", baudrate=115200, dictionary={}):
 
     except Exception as e:
         dictionary["qnwinfo error"] = f"{e}"
-    
+
     return dictionary
 
 
@@ -366,5 +366,5 @@ def get_modem_qspn(port="/dev/ttyUSB2", baudrate=115200, dictionary={}):
 
     except Exception as e:
         dictionary["qspn error"] = f"{e}"
-    
+
     return dictionary
diff --git a/helper_functions.py b/helper_functions.py
index d437591..73440af 100644
--- a/helper_functions.py
+++ b/helper_functions.py
@@ -134,7 +134,7 @@ def save_data_to_json(data, filename):
 def fix_long(bad_long):
     """
     Fix longitude values incorrectly parsed from NMEA (leading zero dropped degrees).
-    
+
     Assumes all values should be around -79.x based on recording location.
     Removes the spurious leading digit from minutes.
     """
@@ -159,18 +159,17 @@ def add_distance_after(filename: str, base_location: dict):
         with open(filename, "r") as file:
             data = json.load(file)
     except FileNotFoundError:
-        print('No file by that name')
+        print("No file by that name")
         return None
-    
-    distance = 'Unknown'
-    
+
+    distance = "Unknown"
+
     for dictionary in data:
-        if 'latitude' in dictionary:
-            # dictionary['longitude'] = fix_long(dictionary['longitude'])
+        if "latitude" in dictionary and type(dictionary["latitude"]) == float:
             distance = calculate_distance(base_location, dictionary)
             dictionary["distance"] = distance
-        elif 'iperf_full' in dictionary:
-            dictionary['start_distance'] = distance
+        elif "iperf_full" in dictionary:
+            dictionary["start_distance"] = distance
 
     # Save updated data back to the file
     with open(filename, "w") as file:
@@ -178,10 +177,15 @@ def add_distance_after(filename: str, base_location: dict):
 
 
 if __name__ == "__main__":
-    filename = '/home/madrigal/repos/range-testing/data/boat_relay_sept_17/test_1758123903_copy.json'
+    filenames = [
+        "/home/madrigal/repos/range-testing/data/boat_relay_sept_18/test_1758215714_copy.json",
+        "/home/madrigal/repos/range-testing/data/boat_relay_sept_18/test_1758217711_copy.json",
+        "/home/madrigal/repos/range-testing/data/boat_relay_sept_18/test_1758219350_copy.json"
+    ]
     base_location = {
-        'latitude': 43.656328,
-        'longitude': -79.307884,
-        'altitude': 80,
+        "latitude": 43.656328,
+        "longitude": -79.307884,
+        "altitude": 80,
     }
-    add_distance_after(filename=filename, base_location=base_location)
+    for filename in filenames:
+        add_distance_after(filename=filename, base_location=base_location)