The Boat Electrics Bible
How To …
Tips and guidance for the Planetarium Apps.
JWMarine
JWMarine
Worked Examples
& Exercises
How To ...
Astro Navigation from Home is my new book on a subject that fascinates me.  In writing all the technical content, I wanted to create a new approach to learning the topic that would show more clearly how the whole position fix process actually works, especially when learning astro navigation from home.  I searched for planetarium apps that would simulate the sextant, finding two alternatives Stellarium and Winstars 3, allowing meaningful sights to be taken on your computer, tablet or phone.  Using one or other of the apps is not necessary for the book and its examples but they greatly enhance the learning process, allowing you to forward plan the sights you will need on a given day and locating the heavenly bodies in the sky, both of which are just as important as the number crunching itself.  In replacing the sextant, they make the complete navigation process accessible to you in your own space and in your own time.  This web site supports the book with useful articles, downloads and worked examples, for instance download No. 2 lists all the web addresses for the apps, almanacs and tables you will need.  Click on more info below for more information about the book's content.
Astro Navigation from Home
Articles and Downloads
Astro Navigation
Weather data at sea
ASTRO NAVIGATION
FROM HOME

a new book from Andy Johnson
Celestial navigation at your fingertips
ASTRO NAVIGATION
FROM HOME
A new book from Andy Johnson
Celestial navigation at your fingertips
Planetarium app issues
and feature updates
Winstars
Stellarium
Other updates to be aware of :

1.  Altitude Correction Table -
     Sun, Stars & Planets :
     Additional Monthly Correction 
     for Venus and Mars.
Other updates to be aware of :

1.  Altitude Correction Table -
     Sun, Stars & Planets :
     Additional Monthly Correction 
     for Venus and Mars.
Featured articles :-
1. Weather data at sea
2. Android plotting app