Celestial Navigation

Astronomic navigation program allows you to calculate your position by means of observations of stars or planets (a nautical almanac is not required).  Enters your position and the sextant altitudes of stars, planets, sun or moon.

• computes and plots the most probable position and an ellipse of probability around it, together with the lines of position (LOPs)
• includes applications for: star fix wizard, azimuth, rhumb line, great circle and ETA 
• written by Johan Machtelinckx while serving as Merchant Navy officer in the Belgian fleet.

The program aims to be a practical option as backup of the today omnipresent GPS. This means that ASNAv aims to reduce additional workload to a minimum. There is little time required other than the time necessary to take the observations themselves.

ASNAv also has the following characteristics:

• it includes an accurate nautical almanac without limit of time;
• it computes rhumb lines on an ellipsoid (e.g. WGS-84) and not only on a sphere;
• great circles are also calculated on an ellipsoid (including composite sailing);
• it is able to find the compass error by means of an azimuth observation;
• a star fix wizard helps to prepare the stars observations;
• it computes ETA (Estimated Time of Arrival) in local time.