United States Power Squadrons Chart Smart Welcome to

United States Power Squadrons® Chart Smart® Welcome to the United States Power Squadrons' Chart Smart Seminar Compass Deviation (Section 2) USPS ® America's Boating Club ® 1/6

United States Power Squadrons® Chart Smart® The TVMDC Formula True Course T Variation V Magnetic Course M Deviation Compass Course D C Add West Subtract East Subtract West Add East 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. USPS ® America's Boating Club ® 2/6

United States Power Squadrons® Chart Smart® u. Select the Deviation for the entry for the USE NEAREST WHEN CONVERTING tabulated USE WHEN CONVERTING TO COMPASS TO MAGNETIC Heading. For greater accuracy, you may interpolate. MAGNETIC HEADINGS USPS ® America's Boating Club ® SHIP'S COMPASS HEADINGS Magnetic Heading Degress Deviation Degrees Compass Heading Degrees Deviation Degrees 000 015 030 045 060 075 5 E 0 4 W 8 W 11 W 14 W 000 015 030 045 060 075 4 E 0 3 W 6 W 9 W 12 W 090 105 120 135 150 165 15 W 14 W 12 W 9 W 6 W 090 105 120 135 150 165 14 W 15 W 14 W 11 W 8 W 180 195 210 225 240 255 3 W 0 3 E 6 E 9 E 12 E 180 195 210 225 240 255 4 W 0 4 E 8 E 12 E 14 E 270 285 300 315 330 345 14 E 15 E 14 E 13 E 11 E 8 E 270 285 300 315 330 345 15 E 14 E 13 E 11 E 9 E 7 E 3/6

United States Power Squadrons® T 140 _____ 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 Compass course to steer is 147 degrees to make good a true course of 140 degrees USPS ® America's Boating Club ® Chart Smart® Add West V 5 E _____ M 135 _____ D 12 W _____ C 147 _____ Subtract East 4/6

United States Power Squadrons® T Example #4 notes - deviation is assumed to be from the Sample Ship's Deviation Table (interpolate); local variation is assumed to be 11 W Compass course to steer is 211 degrees to make good a true course of 204 degrees USPS ® America's Boating Club ® Chart Smart® 204 _____ Add West V 11 W _____ M 215 _____ D 4 E (interpolation req. ) _____ C 211 _____ Subtract East 5/6

United States Power Squadrons® Chart Smart® End of Section 2 D Compass Deviation USPS ® America's Boating Club ® 6/6