up

frontend/src/lib/maidenhead.ts

@@ -77,6 +77,16 @@ export function pathBetween(fromGrid: string, toGrid: string): PathInfo | null {
   const a = gridToLatLon(fromGrid);
   const b = gridToLatLon(toGrid);
   if (!a || !b) return null;
+  return pathBetweenLatLon(a, b);
+}
+
+// pathBetweenLatLon computes the great-circle path between two lat/lon points.
+// Used as a fallback when a station has a known location (e.g. cty.dat entity
+// coordinates for Svalbard) but no Maidenhead grid.
+export function pathBetweenLatLon(
+  a: { lat: number; lon: number },
+  b: { lat: number; lon: number },
+): PathInfo {
   const φ1 = toRad(a.lat);
   const φ2 = toRad(b.lat);
   const Δλ = toRad(b.lon - a.lon);