Notice Advisory to Navstar Users

Notice advisories are messages about changes to systems, such as the Global Positioning System (GPS), that are sent out to people who use them. They tell those users what will happen and how it might affect their use of the system. These messages usually tell you about upcoming changes, such as new satellites being added to the system or software updates being done. They help ensure that you have the most up-to-date information about the system you are using, so you can use it most efficiently.