The Nautical Almanac
The free online Nautical Almanac
The world's most complete source of free celestial navigation information



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Useful Links

The Nautical Almanacs and Sun Almanacs listed on our site were created or derived from a program written by the great Norwegian sailor Enno Rodegerdts. Without his work this site wouldn't exist.

Andrew Bauer

This gentleman has taken the great work of Dr. Rodegerdts and refined it to the excellence you see on our site.  He is unique in this present age of ambition and represents a man of generosity, humility and familiarity of knowledge in making simple those things which are wiseKnowledge,  long and painstaking hours has he expended in developing the works present.  And for what?  Obscurity?  I say, nah, but remembrance and thanks by all of those who love and practice celestial navigation.  He has offered his programs at no charge on his site so that you might benefit from his efforts.
Celestaire

Celestaire is the maker of the famous Astra III and IIIB sextants. They offer many products and tools needed for navigation, weather, communications and astronomy.

Celestaire's customer service is incomparable in terms of courtesy, knowledge and assistance.

Navigatrix

Navigatrix is a complete operating system for your computer.

Navigatrix is a compilation of electronic tools for navigation, communication, information and security that you can use offshore, on shore, or at anchor. It is simple and lightweight and based on the best Debian/Ubuntu has to offer.  Navigatrix also includes OpenCPN.

Excel based celestial navigation spreadsheets which  can also be used with LibreOffice Calc.

This site provides several Excel spreadsheets that will generate a Nautical Almanac, Great Circle sailing waypoints and a star finder.  There is an abundance of information about celestial navigation all on a very handsome site.

Online free nautical charts and publications.  A very comprehensive site providing a huge amount of information covering all aspects of the maritime world.
OpenCPN

Open Chart Plotter Navigation is a free open source chart plotting program.   Included with many plugins OpenCPN also has a celestial navigation sight reduction plugin that graphically shows circles of equal altitude.  OpenCPN is the best free chart plotting program available.
BackBearing.com

This sailor has an excellent Sun Sight reduction Excel spreadsheet and other very useful information.


2019
"American Practical Navigator"

Download only the chapters you want or the entire work.
Originally written by Nathaniel Bowditch, now with many updates.

Shackleton, Worsley, Amundsen, Harrison, Slocum, Sumner
An inexpensive Windows based program created by NavSoft providing many features including the nautical almanac in a compact format.
Erik De Man

Erik, a sailor from Belgium, has information on celestial navigation and compiled Almanacs too.
Umberto Salsi
Mr. Salsi, a magnanimous gentleman from Bologna Italy, has created an excellent explanation of celestial navigation on his website. His work gives a simple, clear and thorough description of how and why celestial navigation works. There are plans on how to make an Astrolabe and how to plot your position using an analog computer- a Globe! If you have difficulty understanding CN Mr. Salsi’s webpage will be of great help.
James Caird Society

The only institution that exists to preserve the memory, honour the remarkable feats of discovery in the Antarctic and commend the outstanding qualities of leadership associated with the name of Sir Ernest Shackleton, KCVO (l874-l922), especially during the ill-fated but glorious Endurance expedition.

Vigilance is a beautifully restored 78 foot gaff-rigged ketch, a fishing trawler, located in Brixham, England.  She was built in 1926 at Upham's Shipyard in Brixham and has seen much great service even during WWII.  After many years she was left to rest and decay, not being cared for, until some noble Friends discovered her then recovered, refitted and restored her to the glorious craft she is today.  Vigilance is currently in Plymouth undergoing further improvements leaving us all to await her return to service.  She will be available for charter, at your pleasure, which will certainly put a smile on your face.
The United States Naval Observatory

The USNO site is finally operational.

MarineInsight.com

World’s No. 1 Complete Maritime Information website about the business of commercial shipping covering all aspects of the trade.  Very informative and honorable.

The most thorough and complete source of information for the world cruising sailor.  "The global site for cruising sailors".


Mr. Smith sails aboard Kiwi Roa which he designed and built. His voyages have taken him to the Southern Hemisphere high latitude regions of Antarctica, South Georgia Island, Patagonia, Falkland Islands, St. Helena, South Africa and Namibia. His photo stories are a pleasure to read and give you the sense of what it’s like to be in various parts of the world most of us will never, or would never, venture to. Peter, also is the designer of the most superlative, proven and reliable anchor- the Rocna.

The cutest and most seaworthy dinghy in the world!

Marine Torrent tracker
First International Marine Torrent For Seafarers
 

The South Georgia Museum is located at Grytviken, South Georgia island, and holds many things from the island's history of whaling, exploration and natural history.  Frank Worsley's nautical almanac is on display there!

“How to survive when Technology doesn’t".

A free, large variety of books in pdf from the time when electronics weren’t available. There are many books about astronomy, navigation and any topic you might be interested in. Most of the books are well written and the authors endeavour to teach you about the subject matter rather than boast of their personal accomplishments.
What Time is it?

Now you can see what time it really is...on the web.

A very impressive graphic display of world weather.
ZyGrib

A grib based weather visualization program.
Excellent for helping you predict the weather.



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