Navigational Algorithms

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Navigational Algorithms is a project about the science part of the art of navigation about:

• Celestial Navigation: Sight Reduction, Line Of Position, Fix...
• Positional Astronomy: RA, GHA, Dec
• Coastal Navigation: Range, Bering, Horizontal angles, IALA...
• Sailings: Rhumbs, Loxodromic, Orthodromic, Meridional parts...
• Weather , Tides
• Software PC- PDA: Nautical Almanac, Sailings, Variation, Sextant corrections

[edit] Navigation Shareware

This secction gives a brief description of the free programs availables for navigation. Run under Windows XP, (maybe under 95/98/2000/NT)

[edit] Nautical Almanac

Ephemerides of the celestial bodies used in navigation.

Nautical Almanac

• GHA - Greenwich Hour Angle
• Dec - Declination
• SD - Semidiameter
• HP - Horizontal Parallax

[edit] CelestialFix

Astronavigation solution for sight reduction for n observations made with a marine sextant & running fixes

Celestial Navigation

The algorithms implemented are: For n = 2 observations

• An analytical solution of the two star sight problem of celestial navigation, James A. Van Allen^[1].
• Vector Solution for the Intersection of two Circles of Equal Altitude. Andrés Ruiz^[2].

For n >= 2 observations

• DeWit/USNO Nautical Almanac/Compac Data, Least squares algorithm for n LOPs
• Kaplan algorithm, USNO^[3]. For n >= 8 observations, gives the solution for course and SOG.

[edit] Magnetic Declination

Declination by World Magnetic Model WMM2005

Any measure of course made with a magnetic compass must be corrected because of the magnetic declination or local variation.

[edit] See also

• Navigation
• Celestial Navigation
• Nautical almanac
• Lunar distance (navigation)
• Sextant
• American Practical Navigator

[edit] References

[edit] External links

• Navigational Algorithms http://www.geocities.com/andresruizgonzalez/
• Vector Solution for the Intersection of Two Circles of Equal Altitude, Andrés Ruiz González. ^[1]
• Journal of Navigation http://journals.cambridge.org/action/displayJournal?jid=NAV
• The Institute of Navigation http://www.ion.org/

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