The whys and wherefores of navigation

Chapter 27: Transcriber’s Note:

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About This Book

Practical guide explains the reasons behind common navigational practices for mariners who perform procedures by rote and seek fuller understanding. It covers compass use and its corrections, dead reckoning, plane, traverse and parallel sailings, and the computations used to determine latitude and longitude. Nautical astronomy topics such as declination, right ascension, time, lunar observations, and corrections for observed altitudes are integrated with treatments of azimuths, the Sumner method, charts, and practical tables, aiming to link routine techniques to their theoretical foundations through clear explanations and worked examples.

Transcriber’s Note:

Words may have multiple spelling variations or inconsistent hyphenation in the text. These have been left unchanged unless indicated below. Obsolete and alternative spellings were left unchanged.

Obvious printing errors, such as duplicate words, backwards, upside down, or partially printed letters and punctuation, were corrected. Final stops missing at the end of sentences and abbreviations were added.

The following items were changed:

“access” to “excess”
“Manoeuvring” to “manoeuvering”
“effect” to “affect”