I've come across a handful of GPS NTP servers, as well as some inexpensive solutions using off-the-shelf receivers and software. Right now I'm just using NTP with a list of servers over the Internet. What is the advantage to using GPS instead (considering the alternative is free)?
Is anyone using GPS for time sync
gpsntptime-synchronization
Best Answer
I've used them at a gambling operation so we could keep accurate time but still have a true air gap between the production network and the internet/corporate network.
With the revenue generated per hour and that on one occasion a single remote sales rep came into the office and plugged in his infected laptop to the corp network and brought it down within minutes (production was unaffected). The effort of using things like gps time to allow for an air gap was worth it.