... than 1E-12P High reliability, high redundancy; GPS, GLONASS, BEIDOU offer reference clock Built-in ... and other agreementsDisplay Indicator: Power, GPS, Compass, GLONASS, rubidium clocks, to maintain, fault LCD display: year, month, day, ... hour and working conditions Compass GPSGLONASS Keyboard: Set the control, station control, the coordinate information CC86131:GPS ...