Adafruit_GPS 
Warning
This library assumes that only valid, supported NMEA sentences are parsed. Parsing invalid or unsupported NMEA sentences may result in memory corruption and/or unhandled faults & exceptions!
This is the Adafruit GPS library - the ultimate GPS library for the ultimate GPS module!
Tested and works great with the Adafruit Ultimate GPS module using MTK33x9 chipset ------> http://www.adafruit.com/products/746
These modules use TTL serial to communicate, 2 pins are required to interface.
Adafruit invests time and resources providing this open source code, please support Adafruit and open-source hardware by purchasing products from Adafruit!
Written by Limor Fried/Ladyada for Adafruit Industries. BSD license, check license.txt for more information All text above must be included in any redistribution
To install, use the Arduino Library Manager to search for 'Adafruit GPS' and install the library.