GPS Satellite Outage Information

All information on this page is taken from the GPS Satellite Outage File and SEM almanacs produced by the US Air Force 2nd Space Operations Squadron, and made available by the US Coast Guard.

Satellite Outage File (SOF) Details

The current SOF is available from CelesTrak here: 2020_361_191918_v01.sof
The latest check for a SOF was on: 2021 January 18, 20:12:10
The SOF was last retrieved on: 2021 January 17, 18:10:16

GPS Satellite Outage Calendar

Historical outages are colored black, Predicted outages are colored gold, Current outages are colored red

     
DecemberJanuary 2021February
SuMoTuWeThFrSa
1
PRN 18

PRN 23

PRN 14

PRN 11
2
PRN 18

PRN 23

PRN 14

PRN 11
3
PRN 18

PRN 23

PRN 14

PRN 11
4
PRN 18

PRN 23

PRN 14

PRN 11
5
PRN 18

PRN 23

PRN 14

PRN 11
6
PRN 18

PRN 23

PRN 14

PRN 11
7
PRN 18

PRN 23

PRN 14

PRN 11
8
PRN 18

PRN 23

PRN 14

PRN 11
9
PRN 18

PRN 23

PRN 14

PRN 11
10
PRN 18

PRN 23

PRN 14

PRN 11
11
PRN 18

PRN 23

PRN 14

PRN 11
12
PRN 18

PRN 23

PRN 14

PRN 11
13
PRN 18

PRN 23

PRN 14

PRN 11
14
PRN 18

PRN 23

PRN 14

PRN 11
15
PRN 18

PRN 23

PRN 14

PRN 11
16
PRN 18

PRN 23

PRN 14

PRN 11
17
PRN 18

PRN 23

PRN 14

PRN 11
18
PRN 18

PRN 23

PRN 14

PRN 11
19
PRN 18

PRN 23

PRN 14

PRN 11
20
PRN 18

PRN 23

PRN 14

PRN 11
21
PRN 18

PRN 23

PRN 14

PRN 11
22
PRN 18

PRN 23

PRN 14

PRN 11
23
PRN 18

PRN 23

PRN 14

PRN 11
24
PRN 18

PRN 23

PRN 14

PRN 11
25
PRN 18

PRN 23

PRN 14

PRN 11
26
PRN 18

PRN 23

PRN 14

PRN 11
27
PRN 18

PRN 23

PRN 14

PRN 11
28
PRN 18

PRN 23

PRN 14

PRN 11
29
PRN 18

PRN 23

PRN 14

PRN 11
30
PRN 18

PRN 23

PRN 14

PRN 11
31
PRN 18

PRN 23

PRN 14

PRN 11

Current GPS Outages

No Current Outages

Predicted GPS Outages

Predicted Outages
PRNSVNOutage TypeReferenceOutage Start TimeOutage End TimeDuration (hrs)
1834FCSTUUFN201915610/7/2019 8:00:00 PM  
2360FCSTUUFN20200103/9/2020 3:30:00 PM  
1441FCSTUUFN20200317/9/2020 6:00:00 PM  
1146FCSTUUFN202007211/10/2020 3:00:00 PM  

Historical GPS Outages

A GPS historical outage table can be accessed from the link below. The historical outages table contains all GPS outages since 1998.

Historical Outages

GPS Satellite Health Information

The information below shows the number of healthy GPS satellites, since 1998. The number of satellites in the GPS constellation comes from the SEM almanac for that day. The number of unhealthy satellites for that day comes from the Satellite Outage File. The SOF outages are subtracted from the number of satellites in the constellation to get the number of healthy satellites.

The list of unused PRN numbers come from those PRNs not listed in the SEM almanac.

Number of GPS satellites in the latest almanac: 31
Number of unhealthy GPS satellites in the SOF: 4
Current number of healthy GPS satellites: 27
Unused PRN number(s): 11

Healthy GPS Satellites Graph

This graph plots the number of healthy GPS satellites since 1998 (Full History), or over the last 365 days.

Note that since this is calculated on a daily boundary, this graph will show sequential outages in a single day as concurrent, and may not reflect the more updated statistics above.