GPS Receiver Kit(CTRL-GPS-RECEIVER-KIT)The Type CTRL-GPS-RECEIVER is an option for the 99B automatic tower clock controller. It provides time accurate to 1 x 10E-6 Seconds.The GPS receiver receives time from the GPS satelite constellation which surrounds the earth. The receiver is standard on all of our Howard and Seth Thomas Street Clocks (premounted on the top of the clock). It must be located with a view of the sky.