da Autore | Mag 27, 2026 | Astronomy, Mathematics, Navigation
Sight reduction with matrix algebra and least squares Sight Reduction with Matrices — R. Watkins & P. M. Janiczek (1978) 1. Description The Watkins & Janiczek method is a technique for computing the astronomical fix from any number of lines of position,...
da Autore | Apr 20, 2026 | Mathematics, Navigation
The direct two-sight fix 1. Description of the method Gery’s method — presented in 1997 by Stanley W. Gery in the NAVIGATION journal of the Institute of Navigation — is a sight-reduction procedure that delivers the ship’s position (fix) directly in closed...
da Autore | Apr 16, 2026 | Mathematics, Navigation
The two-sight fix 1. Description of the method The Van Allen Method — sometimes referred to in the literature as “Direct Sight Reduction” or “two-sight analytical method” — yields the ship’s position (fix) directly from two true altitudes...
da Autore | Ott 15, 2025 | Navigation
THE CHART IS YOUR MOST VALUABLE TOOL Charts are the sailor’s most precious possession. When you learn to read a chart, it may warn you of reefs and submerged wrecks and show the way to safe harbors. If you can locate yourself on a chart and identify surrounding...
da Autore | Giu 29, 2019 | Navigation
NAVIGATION is the Art which instructs the mariner how to conduct a ship over the wide and trackless ocean, from one port to another, with the greatest safety, and in the shortest time possible. Navigation may be divided into two branches: viz. Seamanship,...
da Autore | Mag 18, 2019 | Instruments, Navigation
Various tools and technology have been developed to facilitate the determination of a ship‟s location. From the simple tools, the sextant has been a useful tool along with the tables and almanac. Effects of their use indicated limitations to the accuracy and...
