Using GPS for timing applications has a number of advantages over radio time and frequency services.
GPS is a global system, it consists of a number of orbiting satellites. Provided that you can site a GPS antenna with a good view of the sky, you can obtain a GPS signal lock anywhere in the world. By contrast, radio time and frequency services are regional with a finite reception range.
The GPS system provides a highly accurate timing reference, providing accuracies in the nanosecond range. Radio time and frequency transmissions generally provide accuracies of a few milliseconds.
Provided a GPS antenna has a reasonably good view of the sky, a GPS system can provide a continuously accurate signal that is less prone to interference and maintenance periods.
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