welcome to the united states power squadrons' chart smart seminar
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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. - PowerPoint PPT PresentationTRANSCRIPT
United States Power Squadrons® Chart Smart®
USPS ® America's Boating Club ® 1 / 6
Compass Deviation(Section 2)
Welcome to the
United States Power Squadrons'
Chart Smart Seminar
United States Power Squadrons® Chart Smart®
USPS ® America's Boating Club ® 2 / 6
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.
The TVMDC Formula
Add West
Subtract East
Subtract West
Add East
True Course T
Variation V
Magnetic Course M
Deviation D
Compass Course C
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Select the Deviation for the NEAREST tabulated entry for the Heading. For greater accuracy, you may interpolate.
SHIP'S COMPASS HEADINGSMAGNETIC HEADINGS
USE WHEN CONVERTING TO MAGNETIC
USE WHEN CONVERTING TO COMPASS
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
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
Deviation
Degrees
Compass Heading
Degrees
Deviation
Degrees
Magnetic Heading
Degress
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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
12 W
147
Add West
Subtract East
Compass course to steer is 147 degrees to make good a true course of 140 degrees
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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
4 E (interpolation req.)
211
Add West
Subtract East
Compass course to steer is 211 degrees to make good a true course of 204 degrees
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Compass Deviation
End of Section 2D