GPS NANUS, ALMANACS, OPS ADVISORIES, & SOF
For help on how to understand and/or interpret an Operational Advisory message, please visit our tutorial page.
Format of the messages
Almanacs, Operational Advisories, and NANUs are available for download in two formats:
-
the original format in which the files are produced (.alm, .al3., .nnu, .oa1, and .sof)
-
plain text (.txt)
OPS Advisories (GPS Status)
-
Current Operational Advisories - .oa1, .txt
Almanacs (YUMA & SEM)
-
Current YUMA Almanac - .alm, .txt
-
Current SEM Almanac - .al3, .txt
-
Definition of a YUMA Almanac can be found in the current version of Navstar GPS Control Segment to User Support Community Interfaces, ICD- GPS-240. You can find the document on the GPS Technical References page.
-
Definition of a SEM Almanac can be found in the current version of Navstar GPS Control Segment to User Support Community Interface, ICD- GPS-240. You can find the document on the GPS Technical References page.
NANUs
SATELLITE OUTAGE FILE (SOF)
-
Current SOF - .sof, .txt
-
Definition of the SOF can be found in the current version of Navstar GPS Control Segment to User Support Community Interfaces, ICD- GPS-240. You can find the document on the GPS Technical References page. Higher priority GPS Control Station operations may delay development and publication of the SOF after release of a NANU.
ARCHIVES
-
Almanac, NANU, and Ops Advisory Archives, sorted by year, 1997 through current year (.alm, .al3, .nnu, and .oa1 extensions)
-
Almanac, NANU, and Ops Advisory Archives, sorted by year, 1997 through current year (.txt extension)
In order to aid customers that need to download the various almanac files on a regular or semi-regular basis or who would like to download some or all of the files for one or more years, we have developed a set of access points to allow the download of the files programmatically. Please read the instructions for programmatically downloading NANU, Almanac and Ops Advisory files.