Free and Discounted Ebooks
Join 130,000 readers! Get our ebook deals straight to your inbox.

Lectures in Navigation

Cover image for


Language: English
Wordcount: 43,126 / 133 pg
Flesch-Kincaid Reading Ease: 121.2
LoC Category: VK
Downloads: 1,689
Added to site: 2008.12.29 23009

Prepared for Use as a Text Book at the Officers' Material School Naval Auxiliary Reserve.

Show Excerpt

e in course causes a new amount of Deviation which must be allowed for in correcting the compass reading. It is customary in merchant vessels to have the compasses adjusted while the ship is in port. The adjuster tries to counteract the Deviation all he can by magnets, and then gives the master of the ship a table of the Deviation errors remaining. These tables are not to be depended upon, as they are only accurate for a short time. Ways will be taught you to find the Deviation yourself, and those ways are the only ones you can depend upon.

Put in your Note-Book:

Westerly Deviation is applied exactly as westerly Variation. Easterly Deviation is applied exactly as easterly Variation.

The amount of Variation plus the amount of Deviation is called the Compass Error. For instance, a Variation of 10° W plus a Deviation of 5° W equals a compass error of 15° W, or a Variation of 10° W plus a Deviation of 5° E leaves a net compass error of 5° W.





Join 120,000+ fellow readers! Get Free eBooks and book bargains from ManyBooks in your inbox. 

We respect your email privacy

login | register

User ID


reset password

Author of the Day

Maria La Serra
Maria La Serra believes in love and serendipity. She also believes in creating novels that are a bit different from the regular, run-of-the-mill books that readers have become accustomed to. As our author of the day, La Serra chats with us about her debut work, The Proverbial Mr. Universe, fashion design and serendipity.
Read full interview...