The SparkFun XA1110 GPS Breakout is equipped with the XA1110 GPS module from GTOP and utilizes the MediaTek MT3333 chipset, loaded with specialized SparkFun firmware that enables both I2C and serial ports simultaneously.
This GPS Breakout supports up to 210 PRN channels with 99 search channels and 33 simultaneous tracking channels. With support of GPS, GLONASS, QZSS, SBAS and more, the onboard XA1110 can provide even more accurate positioning in multiple locations. Additionally, the XA1110 GPS Breakout is configured with an onboard RTC battery that enables a warm-start functionality, giving the X1 just five seconds to first fix, as well as a U.FL connector that provides you the option to hook up an external antenna via a U.FL cable.
More information is available on the website of Sparkfun.