While GPS offers a ubiquitous, precise, and reliable positioning and timing service to much of the world, in many cases this service falls short. Anyone who has walked into a building with a GPS receiver actively displaying a location is aware of the immediate effect of the loss of signal. While this is an extreme [...]

The U.S. has provided the highly accurate and dependable GPS service to users worldwide for nearly two decades. In addition to this service, the U.S. has made corresponding commitments as to the types and quality of current and future GPS service through various documents, such as the GPS Standard Positioning Service Performance Standard, the Federal [...]

Today, the civil positioning, navigation, and timing (PNT) community needs a clear and concise statement of PNT needs. This statement should incorporate all aspects of PNT services and all applications and

On September 8, 2009, the US Coast Guard Navigation Center issued a notice reporting a pending GPS service anomaly for September 11, the anomaly being a noticeable increase in dilution of precision (DOP) over an extended period in various parts of the world.

Recently someone I know sent me an email titled “GPS in trouble?”, asking me if I had any information about what happened. He was responding to

We operate our business in Newport, Oregon, and although much of the work we do involves the Global Positioning System (GPS), I can’t help but thinking some of the methods we employ could be applied to managing our ocean resources. Let me explain.