As we mentioned in earlier chapters, time accuracy is critical for GNSS position determination. This is why GNSS satellites are equipped with atomic clocks that are accurate to nanoseconds. As part of the position determining process, the local time of GNSS receivers becomes synchronised with the very accurate satellite time.
This time information, by itself, has many applications, including the synchronisation of communication systems, electrical power grids and financial networks. GNSS-derived time works well for any application where precise timing is needed by devices that are dispersed over a wide area.
Seismic monitors that are synchronised with GNSS satellite clocks can be used to determine the epicentre of an earthquake by triangulation based on the exact time the earthquake was detected by each monitor.