Adafruit ultimate gps hat for raspberry pi a b or 2 adafruit 2324 the ultimate gps hat has a built in real time clock rtc and a gps module adding precision time and location to a raspberry pi model a b or pi 2 the module has an internal patch antenna that works quite well when used outdoors a u fl connector enables connection to an external antenna additional features include status leds pps output on fix and it is possible to obtain 7 years timekeeping by using a cr1220 backup