protected char checkZone(char zone){
  zone=Character.toUpperCase(zone);
  if (zone != 'N' && zone != 'S') {
    throw new NumberFormatException("Invalid UTMPoint zone letter: " + zone);
  }
  return zone;
}

protected char checkZone ( char zone ) { zone = Character . toUpperCase ( zone ) ; if ( zone != 'N' && zone != 'S' ) { throw new NumberFormatException ( "Invalid UTMPoint zone letter: " + zone ) ; } return zone ; }
method that provides a check for utm zone letters . returns an uppercase version of any valid letter passed in , ' n ' or ' s ' .
