This is a class-based library for GPS, it can handle a mixture of NMEA 0183 sentences and UBX formatted data.
The class can parse the following NMEA 0183 sentences
GGA (time,lat,lon,fix_quality) VTG (kph)
Since the default serial rx buffer is only 16 - 64 Bytes and therefore insufficient to contain a complete sentence, you're recommended to modify HardwareSerial.h in arduino core to increase the SERIAL_RX_BUFFER_SIZE.