added flight mechanics

simulator/utils.py

@@ -0,0 +1,17 @@
+import math
+
+
+def haversine_nm(lat1, lon1, lat2, lon2):
+    # Earth radius in nautical miles
+    R = 3440.065
+    phi1, phi2 = math.radians(lat1), math.radians(lat2)
+    dphi = math.radians(lat2 - lat1)
+    dlambda = math.radians(lon2 - lon1)
+
+    a = (
+        math.sin(dphi / 2) ** 2
+        + math.cos(phi1) * math.cos(phi2) * math.sin(dlambda / 2) ** 2
+    )
+    c = 2 * math.atan2(math.sqrt(a), math.sqrt(1 - a))
+
+    return R * c