Furuno’s GF-87 series is a set of Advanced Multi-GNSS Disciplined Oscillators (GNSSDO) that provide highly accurate 1PPS synchronization with UTC time as well as highly stable frequency coherent to 1PPS. While being able to support concurrent GPS, GLONASS QZSS, and SBAS, the GF-87 series is packed with features such as advanced multipath mitigation, active anti-jamming, and holdover function.