public Double calculateAngle(NavigationPosition other) {
   if (hasCoordinates() && other.hasCoordinates()) {
     Bearing bearing =
         calculateBearing(
             getLongitude(), getLatitude(), other.getLongitude(), other.getLatitude());
     return bearing.getAngle();
   }
   return null;
 }
 public Double calculateOrthogonalDistance(NavigationPosition pointA, NavigationPosition pointB) {
   if (hasCoordinates() && pointA.hasCoordinates() && pointB.hasCoordinates()) {
     Bearing bearingAD =
         calculateBearing(
             pointA.getLongitude(), pointA.getLatitude(), getLongitude(), getLatitude());
     Double distanceAtoD = bearingAD.getDistance();
     if (distanceAtoD != null) {
       double courseAtoD = toRadians(bearingAD.getAngle());
       double courseAtoB = toRadians(pointA.calculateAngle(pointB));
       return asin(sin(distanceAtoD / EARTH_RADIUS) * sin(courseAtoD - courseAtoB)) * EARTH_RADIUS;
     }
   }
   return null;
 }
 public Double calculateDistance(NavigationPosition other) {
   return other.hasCoordinates()
       ? calculateDistance(other.getLongitude(), other.getLatitude())
       : null;
 }