Refer to figure.
Considering the following information, determine the true heading.
CH: 220°
Variation: 13°E
Compass heading must first be corrected for deviation to obtain magnetic heading, and then magnetic heading must be corrected for variation to obtain true heading.
Compass heading:
220° (given in the question)
Magnetic Heading:
From the deviation card, in the southerly sector, a compass indication of about 209° corresponds to 210° magnetic and 239° corresponds to 240° magnetic. This shows that, in this range, the compass reads approximately 1° lower than the magnetic heading.
Then Deviation is 1° E. It mus be added to get magnetic heading.
Therefore, for a Compass Heading of 220°, the Magnetic Heading is 221°.
True Heading:
The next step is to apply variation. Since the variation is 13°E, it must be added to the magnetic heading when converting from magnetic to true:
TH = MH + Var = 221° + 13° = 234°
Therefore, the correct answer is 234°.
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