While in the Back River, you sight the two...

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Question 1 of 2066636eea28f7522a1c51aeeb

While in the Back River, you sight the two tanks along the Northwest Branch (vicinity LAT 37°05.6'N, LONG 76°22.0'W) in line bearing 277° per standard magnetic compass. If your vessel is heading 243°psc, what is TRUE?

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Question 1 of 20

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🔍 Key Concepts

• Compass error is the sum of variation and deviation • Difference between true bearing, magnetic bearing, and compass (psc) bearing • How to determine deviation when you have a known charted bearing and an observed compass bearing

💭 Think About

• Start by determining the TRUE bearing of the range line between your position and the two tanks from the chart. How does this compare to the 277° you see on the standard magnetic compass? • Think about the relationship: True ± Variation = Magnetic; Magnetic ± Deviation = Compass (psc). In this question, which of these values are known, and which are you trying to find? • Your vessel’s heading is 243°psc, but the bearing you observe is 277° on the standard magnetic compass. How does that relate to the error of the compass itself, regardless of the ship’s heading?

✅ Before You Answer

• Verify the local variation for the area around LAT 37°05.6'N, LONG 76°22.0'W from the chart before doing any calculations. • Make sure you keep track of east/west signs correctly when moving between True, Magnetic, and Compass (T–M–C). A common memory aid is: "True Virgins Make Dull Company" (T to V to M to D to C). • Confirm whether the range line bearing you’re using from the chart is true or magnetic, and adjust for variation before comparing it to your observed 277° compass bearing.

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