// Requires http://ostermiller.org/utils/StringTokenizer.java.html


    public String getGPGGAFromNMEA(String NMEA) {
        try {
            StringTokenizer tok = new StringTokenizer(NMEA, "$", false);
            while (tok.hasMoreTokens()) {
                String line = tok.nextToken();
                if (line.startsWith("GPGGA")) {
                    return line;
                }
            }
        } catch ( Exception e ) {
            raw.setText(e.toString());
        }
        return null;
    }

    public String getFieldFromGPGGA(String GPGGA, String field) {
        try {
            System.out.println("Parsing " + GPGGA);
            StringTokenizer gpggatok = new StringTokenizer(GPGGA, ",", false);
            String junk = gpggatok.nextToken();
            String utc = gpggatok.nextToken();
            if ( field.equals("utc") ) {
                return utc;
            }
            String latitude = gpggatok.nextToken();
            String northHemi = gpggatok.nextToken();
            String longitude = gpggatok.nextToken();
            String eastHemi = gpggatok.nextToken();
            int quality = Integer.parseInt(gpggatok.nextToken());
            String nSatString = gpggatok.nextToken();
            if ( field.equals("numsats") ) {
                return nSatString;
            }
        } catch (Exception e ) {
            raw.setText(e.toString());
        }
        return null;
    }