Some database changes, started to add threat rings

client/src/other/utils.ts

@@ -204,10 +204,16 @@ export function mToNm(m: number) {
     return m * 0.000539957;
 }
 
+export function nmToM(nm: number) {
+    return nm / 0.000539957;
+}
+
+
 export function nmToFt(nm: number) {
     return nm * 6076.12;
 }
 
+
 export function polyContains(latlng: LatLng, polygon: Polygon) {
     var poly   = polygon.toGeoJSON();
     return turf.inside(turf.point([latlng.lng, latlng.lat]), poly);