Your vessel is proceeding up a channel, and...

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Question 1 of 2066636ee928f7522a1c51a637

Your vessel is proceeding up a channel, and you see a pair of range lights that are in line dead ahead. The chart indicates that the direction of this pair of lights is 093°T, and the variation is 6°E. If the heading of your vessel at the time of the sighting is 097° per standard magnetic compass, what is the correct deviation?

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Question 1 of 20

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🔍 Key Concepts

• Compass error is the difference between true heading and compass heading • Relationship between variation, deviation, and compass error (TVMDC: True, Variation, Magnetic, Deviation, Compass) • A range line that is exactly in line dead ahead gives you your vessel’s true heading along that range

💭 Think About

• First, convert the range line direction from true to what it should be on the standard magnetic compass if there were no deviation. What steps and signs do you use? • Given the vessel’s compass heading and the computed compass heading from the range, which way (east or west) must the deviation be to make them match? • When applying variation and deviation, do you increase or decrease the angle when the correction is labeled east?

✅ Before You Answer

• Be sure you are clear on the sign convention in the TVMDC table: East is least, West is best (in terms of arithmetic when going from true to compass) • Confirm whether you are solving for total compass error first, then separating out variation and deviation • Double‑check which value is the observed compass heading (from the standard compass) and which is the true bearing from the chart

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