GPS Satellite Outages

GPS satellite outages are determined by the US Air Force using a Notice Advisory to Navstar Users (NANU). NANUs are categorized by their type and can represent forecasted, current or summary outages. See the full list of outage types on the CelesTrak website.

Current Time

Current Outages

GPS satellite outages identified as current by the US Air Force. Current outage types are usually reserved for unscheduled outages.

There are no current outages at this time.

Predicted Outages

GPS satellite outages identified as predicted by the US Air Force.

PRNSVNNANUTypeOutage startOutage stopDuration
25622018062FCSTDVDec 14, 2018 05:15:00Dec 14, 2018 17:15:0000d:12h:00m:000s

Recent Outages

GPS satellite outages identified as historical by the US Air Force, occurring within the last month.

PRNSVNNANUTypeOutage startOutage stopDuration
18342018050UNUNOREFNov 12, 2018 15:28:00Nov 12, 2018 15:30:0000d:00h:02m:000s
18342018052UNUNOREFNov 14, 2018 15:15:00Nov 14, 2018 15:19:0000d:00h:04m:000s
18342018055UNUSABLENov 17, 2018 17:01:00Dec 03, 2018 19:49:0016d:02h:48m:000s
24652018058FCSTSUMMDec 07, 2018 04:50:00Dec 07, 2018 11:14:0000d:06h:24m:000s
18342018059UNUSABLEDec 03, 2018 23:09:00Dec 10, 2018 20:27:0006d:21h:18m:000s
18342018061UNUNOREFDec 11, 2018 03:02:00Dec 11, 2018 03:03:0000d:00h:01m:000s

Last checked for outage data: 2018-12-12 10:31:39Z

Other links

GPS outages in a calendar format from AGI can be found here:

GPS Satellite Outage Calendar

Historical GPS Outages can be found here:

Historical GPS Satellite Outages

Navigation blog entries

Gps Basics
The basics of how GPS works with some technical content.

How Long Can You Use an Almanac?
GPS position data is contained in almanac files. Learn how long you can use these for analysis.

Selection of my published papers

Operational Considerations for Improved Accuracy with an IOC Galileo Constellation
This paper looks at how the Galileo operators can improve the performance of an initial Galileo constellation by managing their ephemeris and clock errors. Keeping those errors small can help keep initial positioning errors small, even when large DOPs are present.

Long term prediction of GPS accuracy - Understanding the Fundamentals
Topics on prediction methods for GPS and how long GPS errors can be predicted. Starting from an understanding of the elements of prediction, including almanac use and ephemeris and clock errors, I look at the statistics of GPS position error predictions under various scenarios.

Statistical Analysis of Military and Civilian Navigation Error Data Services
This paper examines the difference between ephemeris and clock errors generated using civilian data versus those generated using military data. The different data sources result from civilian GPS receiver and military GPS receiver.