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Descripción:

Since J W Norie published the first edition of this famous set of mathematical tables in 1803, the book has become – and remained - a bestseller. Despite developments in electronic navigation it remains an essential requirement for anyone learning and practising astro-navigation.

Since the commissioning of the Global Positioning System (GPS), its proven accuracy and reliability in all weather conditions have resulted in confidence and almost unquestioning dependence on its ability to provide a vessel’s position, course and speed. Because of this, some seafarers feel that the traditional navigational methods are obsolete. However, the marine environment of heavy vibration, stormy seas, salt-laden spray and wide temperature variations can easily damage electronic equipment. No prudent seafarer would proceed on an ocean passage without a reliable navigational back-up.

Because of the difficulties which may be experienced if GPS should be unavailable, the book gives an Explanation in the form of a detailed step-by-step description, by means of worked examples, of the different methods of calculating the ship’s position using the tables and/or a pocket calculator.

Since the last update in 2007, the editor, George Blance, has made many changes- new tables have been included and obsolete ones deleted to conform with changing techniques of navigation, with the aim of improving the accuracy of the calculated position and reducing the tedium of the calculation. The section Seaports of the World has again been extensively updated and restructured with several hundred additional ports. The ports are listed geographically and also indexed alphabetically to aid identification.



Índice:

Explanation of tables

COMPUTATION TABLES
Traverse Table
Meridional parts of the terrestial spheroid
Logarithms of numbers
Logarithms of trigonometrical functions
Haversines
Natural Trigonometrical functions of angles

CELESTIAL NAVIGATION
A, B, C Azimuth tables
True azimunths at rising and setting
Ex-meridian table 1
Ex-meridian table 2
Ex-meridian table 3
Ex-meridian table 4
Dip of the sea horizon
Monthly mean semi-diameter of the sun
Reduction of the moon´s horizontal parallax
Parallax in altitude of the sun
Augmentation of the moon´s semi-diameter
Mean refraction
Refraction, additional corrections
Total correction, sun´s lower limb
Total correction, sun´s upper limb
Total correction, stars
Total correction, moon´s lower limb
Total correction, moon´s upper limb

COASTAL NAVIGATION
Day´s run - average speed table
Measured mile speed table
Speed and distance tables
Distance of the sea horizon
Extreme range table
Range by vertical sextant angle
Range by sextant
3cm radar range table
1/2 convergency correction of radio DF bearings

CONVERSION TABLES
Imperial, SI and US Units
Conversion of arc into time
Conversion of time into arc
Hours, minutes and seconds to decimals of a day
Barometric pressure, millibars and iches of mercury
Celsius and fahrenheit temperatures
Imperial gallons, US gallons and litres
Kilometres, statute miles and international nautical milles
Metres and fathoms
Decimals of a degree

SEAPORTS OF THE WORLD
List of seaports
Index of seaports