diff --git a/gen/airfields.py b/gen/airfields.py
index 1acba323..7322431f 100644
--- a/gen/airfields.py
+++ b/gen/airfields.py
@@ -1363,55 +1363,73 @@ AIRFIELD_DATA = {
     "Detling": AirfieldData(
         theater="Channel",
         elevation=623,
-        runway_length=2557,
-        atc=AtcData(MHz(3, 950), MHz(118, 400), MHz(38, 800), MHz(250, 400)),
+        runway_length=3482,
+        atc=AtcData(MHz(4, 50), MHz(118, 600), MHz(39, 0), MHz(250, 600)),
     ),
     "High Halden": AirfieldData(
         theater="Channel",
         elevation=104,
         runway_length=3296,
-        atc=AtcData(MHz(3, 750), MHz(118, 800), MHz(38, 400), MHz(250, 0)),
+        atc=AtcData(MHz(3, 800), MHz(118, 100), MHz(38, 500), MHz(250, 100)),
     ),
     "Lympne": AirfieldData(
         theater="Channel",
         elevation=351,
-        runway_length=2548,
-        atc=AtcData(MHz(3, 925), MHz(118, 350), MHz(38, 750), MHz(250, 350)),
+        runway_length=3054,
+        atc=AtcData(MHz(4, 25), MHz(118, 550), MHz(38, 950), MHz(250, 550)),
     ),
     "Hawkinge": AirfieldData(
         theater="Channel",
         elevation=524,
         runway_length=3013,
-        atc=AtcData(MHz(3, 900), MHz(118, 300), MHz(38, 700), MHz(250, 300)),
+        atc=AtcData(MHz(4, 0), MHz(118, 500), MHz(38, 900), MHz(250, 500)),
     ),
     "Manston": AirfieldData(
         theater="Channel",
         elevation=160,
         runway_length=8626,
-        atc=AtcData(MHz(3, 875), MHz(118, 250), MHz(38, 650), MHz(250, 250)),
+        atc=AtcData(MHz(3, 975), MHz(118, 250), MHz(38, 650), MHz(250, 250)),
     ),
     "Dunkirk Mardyck": AirfieldData(
         theater="Channel",
         elevation=16,
         runway_length=1737,
-        atc=AtcData(MHz(3, 850), MHz(118, 200), MHz(38, 600), MHz(250, 200)),
+        atc=AtcData(MHz(3, 950), MHz(118, 450), MHz(38, 850), MHz(250, 450)),
     ),
     "Saint Omer Longuenesse": AirfieldData(
         theater="Channel",
         elevation=219,
         runway_length=1929,
-        atc=AtcData(MHz(3, 825), MHz(118, 150), MHz(38, 550), MHz(250, 150)),
+        atc=AtcData(MHz(3, 925), MHz(118, 350), MHz(38, 750), MHz(250, 350)),
     ),
     "Merville Calonne": AirfieldData(
         theater="Channel",
         elevation=52,
         runway_length=7580,
-        atc=AtcData(MHz(3, 800), MHz(118, 100), MHz(38, 500), MHz(250, 100)),
+        atc=AtcData(MHz(3, 900), MHz(118, 300), MHz(38, 700), MHz(250, 300)),
     ),
     "Abbeville Drucat": AirfieldData(
         theater="Channel",
         elevation=183,
         runway_length=4726,
+        atc=AtcData(MHz(3, 875), MHz(118, 250), MHz(38, 650), MHz(250, 250)),
+    ),
+    "Eastchurch": AirfieldData(
+        theater="Channel",
+        elevation=30,
+        runway_length=2983,
         atc=AtcData(MHz(3, 775), MHz(118, 50), MHz(38, 450), MHz(250, 50)),
     ),
+    "Headcorn": AirfieldData(
+        theater="Channel",
+        elevation=114,
+        runway_length=3680,
+        atc=AtcData(MHz(3, 825), MHz(118, 150), MHz(38, 550), MHz(250, 150)),
+    ),
+    "Biggin Hill": AirfieldData(
+        theater="Channel",
+        elevation=552,
+        runway_length=3953,
+        atc=AtcData(MHz(3, 850), MHz(118, 200), MHz(38, 600), MHz(250, 200)),
+    ),
 }