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

Contents

[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
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
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
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

[edit] References

  1. ^ An analytical solution of the two star sight problem of celestial navigation. James A. Van Allen. NAVIGATION Vol. 28, No. 1, 1981
  2. ^ Vector Solution for the Intersection of Two Circles of Equal Altitude. Andrés Ruiz González. Journal of Navigation, Volume 61, Issue 02, April 2008, pp 355-365.The Royal Institute of Navigation
  3. ^ Determining the Position and Motion of a Vessel from Celestial Observations, Kaplan, G. H. Navigation, Vol. 42, No. 4, 1995, pp. 631-648

[edit] External links


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