This famous set of mathematical tables was first published in 1803 It has been a bestseller ever since & despite developments in electronic navigation it remains an essential requirement for anyone learning & practising astro-navigation Last updated in 1994 the editor George Blance has worked for some time on the modernisation of all the tables for this major new edition New tables have been included & obsolete ones deleted to conform with the changing techniques of navigation with the aim of improving the accuracy of the calculated position & reducing the tedium of the calculation All the tables required for coastal & deep sea navigation are included A simple uniform method of interpolation for all the trigonometrical tables is used Certain tables & data are also included which are not readily available on board ship or are only used in the examination room The section ' Seaports of the World' has also been extensively updated & restructured with several hundred additional ports The ports are listed geographically in the following order from Arctic Russia Scandinavia the Baltic Sea the Atlantic coast of Europe the Mediterranean Sea West Africa East Africa Arabia the Persian Gulf the Indian sub-continent the Far East Australasia the west coast of North & South America & finally the east coast of North & South America At the back of the section is an index of the seaports