GPS Receiver - GP1818MK (56 Channel)

The GP1818MK is a compact, high performance, easy to use GPS smart antenna receiver with -165dBm tracking sensitivity and only 29 second cold start time. This 56-channel GPS module, compatible with the uBlox 7th generation chipset, has an operating voltage of 3.3V, an antenna on board, and connects to your system via TTL serial

More information is available on the website of Sparkfun.