code: public static LocalLongitude getInstance(double longitude, double latitude)
      {
          if (Math.abs(longitude) < 179)
          {
              return new LocalLongitude(latitude);
          }
          else
          {
              return new PacificLongitude(latitude);
          }
      }
docs: Returns LocalLongitude instance which is usable about 60 NM around starting
  point.
  @param longitude
  @param latitude
  @return