... and frequency control technology, Receiver’s high stability rubidium atomic clocks will be locked in GPS, GLONASS, BEIDOU satellite’s ... clock is unavailable, the CC86131 can tame rubidium atomic clocks with historic data. Then reference clock return to normal ... and other agreements Display Indicator: Power, GPS, Compass, GLONASS, rubidium clocks, to maintain, fault LCD display: year, month, day, hour ...