Your vessel is proceeding down a channel,...

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Question 1 of 2066636eea28f7522a1c51b7e7

Your vessel is proceeding down 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 229°T, and variation is 6°W. If the heading of your vessel at the time of the sighting is 232° per standard magnetic compass, what is the deviation?

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Question 1 of 20

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🔍 Key Concepts

• Compass error triangle: relationship between True (T), Magnetic (M), Compass (C), Variation (Var), and Deviation (Dev) • Rule of thumb for variation: "East is least, West is best" when converting between True and Magnetic • How to find deviation when you know the compass heading and the correct magnetic heading

💭 Think About

• Start with the charted range bearing (True). How do you correctly apply a westerly variation to get the magnetic bearing? • Once you have the correct magnetic bearing of the range, compare it with the standard magnetic compass heading. Which side (east or west) is the compass reading from the magnetic? • Recall the relationship: Compass = Magnetic ± Deviation. Use your two headings to solve for the sign and size of deviation.

✅ Before You Answer

• Be sure you apply westerly variation in the correct direction when going from True to Magnetic • Double-check that you are comparing the same direction (both should be either towards the range or along the vessel’s heading) • Confirm the sign of deviation: if the compass reads higher than magnetic, deviation is west; if lower, deviation is east

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