The U.S. Global Positioning System (GPS)—the first GNSS—was developed in the early 1970s by the U.S. Department of Defense ...

This update will work for Trimble GNSS receivers under warranty that use ... customers using more sophisticated real-time kinematic (RTK) receivers may also affect which users will see a disturbance.

In both cases, achieving sufficient precision would be impossible (or highly cumbersome) with GNSS signals alone — or even with a less reliable RTK network. With access to a broad network of RTK ...