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Welcome to the United States Power Squadrons' Chart Smart Seminar. Compass Deviation (Section 2). True Course. T. Add West Subtract East. Variation. V. Magnetic Course. M. . Deviation. D. Subtract West Add East. Compass Course. C. The TVMDC Formula.

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Welcome to the united states power squadrons chart smart seminar
Welcometo theUnited States Power Squadrons'Chart Smart Seminar

Compass Deviation

(Section 2)


True Course

T

Add West

Subtract East

Variation

V

Magnetic Course

M

Deviation

D

Subtract West

Add East

Compass Course

C

The TVMDC Formula

Deviation is different for each boat and depends upon a number of items.

Our class deviation is assumed to be from the Sample Ship's Deviation Table.


USE WHEN CONVERTING TO COMPASS

USE WHEN CONVERTING TO MAGNETIC

MAGNETIC HEADINGS

SHIP'S COMPASS HEADINGS

  • Select the Deviation for the NEAREST tabulated entry for the Heading. For greater accuracy, you may interpolate.

Magnetic Heading

Degress

Deviation

Degrees

Compass Heading

Degrees

Deviation

Degrees

000

015

030

045

060

075

090

105

120

135

150

165

180

195

210

225

240

255

270

285

300

315

330

345

5 E

0

4 W

8 W

11 W

14 W

15 W

15 W

14 W

12 W

9 W

6 W

3 W

0

3 E

6 E

9 E

12 E

14 E

15 E

14 E

13 E

11 E

8 E

000

015

030

045

060

075

090

105

120

135

150

165

180

195

210

225

240

255

270

285

300

315

330

345

4 E

0

3 W

6 W

9 W

12 W

14 W

15 W

15 W

14 W

11 W

8 W

4 W

0

4 E

8 E

12 E

14 E

15 E

14 E

13 E

11 E

9 E

7 E

Chart Smart 2002


Add West

Subtract East

Example #3 notes - deviation is assumed to be from the Sample Ship's Deviation Table (no interpolation); local variation is assumed to be 5 E

T _____

V _____

M _____

D _____

C _____

140

5 E

135

Compass course to steer is 147 degrees to make good a true course of 140 degrees

12 W

147


Add West

Subtract East

Example #4 notes - deviation is assumed to be from the Sample Ship's Deviation Table (interpolate); local variation is assumed to be 11 W

T _____

V _____

M _____

D _____

C _____

204

11 W

215

Compass course to steer is 211 degrees to make good a true course of 204 degrees

4 E (interpolation req.)

211


End of section 2d
End of Section 2D

Compass Deviation


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