The Complete Yachtmaster by Tom Cunliffe & Tom Cunliffe

Author:Tom Cunliffe & Tom Cunliffe
Language: eng
Format: epub
ISBN: 9781472908872
Publisher: Bloomsbury Publishing
Published: 2014-04-16T04:00:00+00:00

True = True

Virgins apply Variation (error west, compass best etc)

Make gives Magnetic

Dull apply Deviation

Companions gives Compass

Fig 16.2 A deviation card.

If you are converting from compass through to true and you happen to be British, ‘Cadbury’s Dairy Milk Very Tasty’ will stand you in good stead. If you are not a native of Blighty you may never have heard of this noble confection, so you’ll either have to come up with something else, or reverse your True Virgins.

Note that because deviation is applied to the magnetic heading, you must refer to this on the deviation card, not the true heading. The difference is unlikely to matter in practice, although it might in a steel yacht, but principle is principle, and we may as well get it right.

Here’s a full-on ‘True to Compass’ example, complete with deviation, true virgins and all the fun of the fair. Tackle it step by step and its bark is far worse than its bite.

Course to steer is 145°T

Variation is 7°W

Deviation is 6°E

What is the Compass Course?

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