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_213_190230_v01.sof
The latest check for a SOF was on:	2020 August 3, 14:26:03
The SOF was last retrieved on:	2020 August 3, 12:03:22

GPS Satellite Outage Calendar

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

January February March April May June July August September October November December   1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020    

July August 2020 September
Su	Mo	Tu	We	Th	Fr	Sa
						1 PRN 18 PRN 23 PRN 14 PRN 23
2 PRN 18 PRN 23 PRN 14 PRN 23	3 PRN 18 PRN 23 PRN 14 PRN 23	4 PRN 18 PRN 23 PRN 14 PRN 23	5 PRN 18 PRN 23 PRN 14 PRN 23	6 PRN 18 PRN 23 PRN 14 PRN 16 B 21:00 PRN 23	7 PRN 18 PRN 23 PRN 14 PRN 16 E 09:00 PRN 23	8 PRN 18 PRN 23 PRN 14 PRN 23
9 PRN 18 PRN 23 PRN 14 PRN 23	10 PRN 18 PRN 23 PRN 14 PRN 23	11 PRN 18 PRN 23 PRN 14 PRN 23	12 PRN 18 PRN 23 PRN 14 PRN 23	13 PRN 18 PRN 23 PRN 14 PRN 23	14 PRN 18 PRN 23 PRN 14 PRN 23	15 PRN 18 PRN 23 PRN 14 PRN 23
16 PRN 18 PRN 23 PRN 14 PRN 23	17 PRN 18 PRN 23 PRN 14 PRN 23	18 PRN 18 PRN 23 PRN 14 PRN 23	19 PRN 18 PRN 23 PRN 14 PRN 23	20 PRN 18 PRN 23 PRN 14 PRN 23	21 PRN 18 PRN 23 PRN 14 PRN 23	22 PRN 18 PRN 23 PRN 14 PRN 23
23 PRN 18 PRN 23 PRN 14 PRN 23	24 PRN 18 PRN 23 PRN 14 PRN 23	25 PRN 18 PRN 23 PRN 14 PRN 23	26 PRN 18 PRN 23 PRN 14 PRN 23	27 PRN 18 PRN 23 PRN 14 PRN 23	28 PRN 18 PRN 23 PRN 14 PRN 23	29 PRN 18 PRN 23 PRN 14 PRN 23
30 PRN 18 PRN 23 PRN 14 PRN 23	31 PRN 18 PRN 23 PRN 14 PRN 23

Current GPS Outages

Current Outages

Predicted GPS Outages

Predicted Outages

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):	14

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.

Full HistoryLast 365 Days