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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
3692019057FCSTDVApr 19, 2019 08:45:00Apr 19, 2019 20:45:0000d:12h:00m:000s

Recent Outages

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

PRNSVNNANUTypeOutage startOutage stopDuration
18342019039UNUNOREFMar 20, 2019 13:34:00Mar 20, 2019 13:36:0000d:00h:02m:000s
29572019041FCSTSUMMMar 22, 2019 05:22:00Mar 22, 2019 11:36:0000d:06h:14m:000s
18342019042UNUNOREFMar 27, 2019 10:48:00Mar 27, 2019 10:49:0000d:00h:01m:000s
18342019044UNUNOREFMar 29, 2019 13:05:00Mar 29, 2019 13:06:0000d:00h:01m:000s
18342019045UNUNOREFMar 29, 2019 13:08:00Mar 29, 2019 13:10:0000d:00h:02m:000s
18342019046UNUNOREFApr 01, 2019 14:02:00Apr 01, 2019 14:04:0000d:00h:02m:000s
32702019047FCSTSUMMApr 04, 2019 10:16:00Apr 04, 2019 11:42:0000d:01h:26m:000s
18342019048UNUNOREFApr 04, 2019 13:52:00Apr 04, 2019 13:53:0000d:00h:01m:000s
18342019051UNUNOREFApr 07, 2019 13:48:00Apr 07, 2019 13:50:0000d:00h:02m:000s
18342019052UNUNOREFApr 07, 2019 13:53:00Apr 07, 2019 13:55:0000d:00h:02m:000s
18342019053UNUNOREFApr 09, 2019 13:29:00Apr 09, 2019 13:31:0000d:00h:02m:000s
32702019054FCSTSUMMApr 09, 2019 09:41:00Apr 09, 2019 14:04:0000d:04h:23m:000s
18342019055UNUNOREFApr 10, 2019 13:18:00Apr 10, 2019 13:19:0000d:00h:01m:000s
18342019056UNUNOREFApr 10, 2019 13:21:00Apr 10, 2019 13:22:0000d:00h:01m:000s
18342019058UNUNOREFApr 11, 2019 13:26:00Apr 11, 2019 13:27:0000d:00h:01m:000s
22472019059FCSTSUMMApr 12, 2019 08:29:00Apr 12, 2019 14:32:0000d:06h:03m:000s
18342019060UNUNOREFApr 17, 2019 13:13:00Apr 17, 2019 13:14:0000d:00h:01m:000s

Last checked for outage data: 2019-04-19 09:02:28Z


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.