You are proceeding up a channel at night. It...

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Question 1 of 2066636ee928f7522a1c519edf

You are proceeding up a channel at night. It is marked by a range which bears 185°T. You steady up on a compass course of 180° with the range in line dead ahead. This indicates that you(r) __________.

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Question 1 of 20

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🔍 Key Concepts

• range marks and bearings – what it means when a range line has a known true bearing (185°T) • compass course vs. true bearing – relationship between what you steer (compass) and where the range actually lies (true) • compass error (variation + deviation) – how to detect if your compass is off by comparing compass and true directions

💭 Think About

• If the range line lies on 185° TRUE, but you see it dead ahead while steering 180° COMPASS, what does that say about your compass compared to true? Is it reading too high or too low? • Think about current: would a current change the bearing of a fixed range to you, or just your track over the ground? Would current explain an apparent disagreement between compass heading and known true bearing? • If your heading and the range line disagree numerically, what must be wrong: the ship’s head, the compass, or your assumed course?

✅ Before You Answer

• Compare the known true bearing of the range (185°T) with the compass course you are steering (180°) while the range is visually exactly ahead. • Decide if the compass is under-reading or over-reading compared to true; that tells you the sense of compass error (westerly or easterly). • Ask whether you would need to alter course right or left to put the ship on the actual 185°T range line, and whether that is already happening if the range is dead ahead.

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