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Welcome to the United States Power Squadrons' Chart Smart Seminar

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

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  1. Welcometo theUnited States Power Squadrons'Chart Smart Seminar Compass Deviation (Section 2)

  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.

  3. 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

  4. 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

  5. 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

  6. End of Section 2D Compass Deviation

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