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Manufacturer: Witherby Seamanship

Celestial Navigation (ASNAv)

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This program calculates your position by means of observations of stars or planets (a nautical almanac is not required). The user enters only his estimated position and the sextant altitudes of stars, planets, sun or moon. The program computes and plots the most probable position and an ellipse of probability around it, together with the lines of position (LOPs). Also includes applications for: star fix wizard, azimuth, rhumb line, great circle and ETA. Compatible with Windows 10.

SKU: 024.4035

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Celestial Navigation is a unique package for the computation of sights and sight reduction by conducting the following statistical analysis:

each observation can include some minor errors, perhaps due to a poor horizon, clouds or the ship rolling while taking your observations. It is difficult to estimate for yourself the quality of a given observation due to the fact that these small errors generally counterbalance each other. For this reason the ASNAv program gives a certain weight to each observation according to its reliability in the normal law model.
very often an observer will repeat the same constant error for each observation (uncorrected sextant index error and personal error etc). This systematic error of the observer can be computed and eliminated
the program can also correct the assumed course and speed if sufficient observations are provided (this is done in exactly the same manner that the GPS gives a course and speed of the vessel if sufficient satellites are visible).

Additional Features:

     - Star fix wizard to help prepare for star observations
     - Compass errors - Azimuth calculations
     - Single rhumb line, great circle and composite great circle calculations on ellipsoid (e.g. WGS-84) and not only on a sphere
     - Comprehensive manual (help file) with an introduction to celestial navigation

See this website for more information on the celestial navigation.

Celestial Navigation is a unique package for the computation of sights and sight reduction by conducting the following statistical analysis:

each observation can include some minor errors, perhaps due to a poor horizon, clouds or the ship rolling while taking your observations. It is difficult to estimate for yourself the quality of a given observation due to the fact that these small errors generally counterbalance each other. For this reason the ASNAv program gives a certain weight to each observation according to its reliability in the normal law model.
very often an observer will repeat the same constant error for each observation (uncorrected sextant index error and personal error etc). This systematic error of the observer can be computed and eliminated
the program can also correct the assumed course and speed if sufficient observations are provided (this is done in exactly the same manner that the GPS gives a course and speed of the vessel if sufficient satellites are visible).

See this website for more information on the celestial navigation.