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Chapman Piloting and Seamanship by Jonathan Eaton

Author:Jonathan Eaton , Date: March 14, 2020 ,Views: 269

Chapman Piloting and Seamanship by Jonathan Eaton

Author:Jonathan Eaton
Language: eng
Format: epub
Tags: ebook
Publisher: Sterling Publishing Co., Inc.
Published: 2017-10-23T16:00:00+00:00


When “correcting” a magnetic course with easterly variation to a true course, add the variation.

The basic rule is easily altered for application to the three other operations of conversion. Remember to always change two, but only two words in the phrase for any application—never only one, never all three; see Examples 2 and 3.

EXAMPLE 2

Given: The magnetic course is 068°; the variation is 14° W; there is no deviation.

Required:The true course, TC.

Calculation:The conversion is correcting and the variation is westerly. In the basic rule, EAST has been changed to WEST; one word has been changed, another must be. Since this calculation is correcting, “add” must become “subtract.” The rule to be applied here is thus: Correcting subtract west. 068° - 14° = 054°

Answer:TC 054°



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