//        ftp://sundae.triumf.ca/pub/peter/index.html
//        GGA - Global Positioning System Fix Data
//        GGA,123519,4807.038,N,01131.324,E,1,08,0.9,545.4,M,46.9,M, , *42
//           123519       Fix taken at 12:35:19 UTC
//           4807.038,N   Latitude 48 deg 07.038' N
//           01131.324,E  Longitude 11 deg 31.324' E
//           1            Fix quality: 0 = invalid
//                                     1 = GPS fix
//                                     2 = DGPS fix
//           08           Number of satellites being tracked
//           0.9          Horizontal dilution of position
//           545.4,M      Altitude, Metres, above mean sea level
//           46.9,M       Height of geoid (mean sea level) above WGS84
//                        ellipsoid
//           (empty field) time in seconds since last DGPS update
//           (empty field) DGPS station ID number
//
//        RMC - Recommended minimum specific GPS/Transit data
//        RMC,225446,A,4916.45,N,12311.12,W,000.5,054.7,191194,020.3,E*68
//           225446       Time of fix 22:54:46 UTC
//           A            Navigation receiver warning A = OK, V = warning
//           4916.45,N    Latitude 49 deg. 16.45 min North
//           12311.12,W   Longitude 123 deg. 11.12 min West
//           000.5        Speed over ground, Knots
//           054.7        Course Made Good, True
//           191194       Date of fix  19 November 1994
//           020.3,E      Magnetic variation 20.3 deg East
//           *68          mandatory checksum
//
// Checksumme ist das exclusiv Oder aller Zeichen zwischen '$' und '*'
// inklusive aller Trennkomma's.
// Die Zeichen '$' und '*' sind nicht in der Checksumme enthalten.