On 10 August your vessel's 0426 zone time DR...

Question 1 / 2066636eea28f7522a1c51a9c3

Question 1 of 2066636eea28f7522a1c51a9c3

On 10 August your vessel's 0426 zone time DR position is LAT 52°07'N, LONG 142°16'E, when an amplitude of the Sun is observed. The Sun's lower limb is about 20 minutes of arc above the visible horizon and bears 074.5° per standard compass. Variation in the area is 12°W. The chronometer reads 07h 24m 19s and is 02m 34s fast. Which of the following is the deviation of the standard compass?

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🔍 Key Concepts

• Amplitude of the Sun to find compass error (difference between true and observed bearing) • How to get true bearing of the Sun at the time of observation using date, latitude, and Sun’s declination • Relationship among true bearing, variation, deviation, and compass course: T → M → C

💭 Think About

• First, think about how you correct the chronometer time and why you need an approximate local hour angle (LHA) or azimuth for the Sun when doing an amplitude check. • Ask yourself: once I know the Sun’s true bearing at rising/setting, how do I compare that with the standard compass bearing to get total compass error? • After I find total compass error, how do I separate it into variation and deviation to get the deviation alone?

✅ Before You Answer

• Be sure you are using the correct declination of the Sun for 10 August at the correct GMT (UT) — from the Nautical Almanac. • Check that you are applying signs correctly when going from true to magnetic to compass (east/west rules for variation and deviation). • Verify that you are using the standard compass bearing of the Sun (074.5°) and not confusing it with a gyro or magnetic compass reading.

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Question 1 of 20

0.0°

1.3°W

1.3°E

2.3°W

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Question 1 / 2066636eea28f7522a1c51a9c3

Question 1 of 2066636eea28f7522a1c51a9c3

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Question 1 of 20

66636eea28f7522a1c51a9c3

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🔍 Key Concepts

💭 Think About

✅ Before You Answer

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