serial.write output GPS sentence formation and concatenation

Projects Programming
14 
  // Send Vehicle ID and NEMA data out of serail port
  Serial << Veh_ID << NMEA1 << "\n";
  Serial << Veh_ID << NMEA2 << "\n";

Do you know EXACTLY what the << operator is doing? If not, quit being lazy. Typing 2 Serial.print() statements and 2 Serial.println() statements ONCE is not going to wear your fingers out.