You need to attach the GPS and its PPS pin (Pulse per second) to the gpio on the rpi. Gives you microsecond NTP, pretty cool if you need that. It can be used to

You need to attach the GPS and its PPS pin (Pulse per second) to the gpio on the rpi. Gives you microsecond NTP, pretty cool if you need that. It can be used to sync network, radios and audio over long distances.