On 2 March your 2216 ZT DR position is LAT...

Question 1 / 2066636eea28f7522a1c51ac30

Question 1 of 2066636eea28f7522a1c51ac30

On 2 March your 2216 ZT DR position is LAT 21° 20.0' S, LONG 17° 10.0' W. At that time, you observe Saturn bearing 078° psc. The chronometer reads 11h 14m 04s, and the chronometer error is 02m 20s slow. The variation is 4.5° W. What is the deviation of the standard compass?

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🔍 Key Concepts

• Amplitude or azimuth of a celestial body to find compass error • Relationship between true bearing, magnetic bearing, compass bearing, variation, and deviation • Correcting chronometer time and using the Nautical Almanac for GHA and declination

💭 Think About

• How do you turn the observed compass bearing of Saturn into a true bearing using sight reduction (or tables/software)? • Once you have the true bearing of Saturn, how do you work step‑by‑step from true to magnetic, and then from magnetic to compass, keeping track of signs for west/east? • How does a chronometer that is slow affect the UT you use for the celestial body’s position, and why does that matter for its computed true bearing?

✅ Before You Answer

• Be clear on the order of corrections: Compass ⇄ Magnetic ⇄ True, and where variation and deviation are applied. • Verify the sign convention: Is west variation and west deviation added or subtracted when going from true to compass in your method? • Double‑check that you used the correct UT from the chronometer (including error) before taking GHA and declination, so your calculated azimuth is valid.

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Question 1 of 20

1.5° W

1.6° E

2.9° W

3.6° E

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Question 1 / 2066636eea28f7522a1c51ac30

Question 1 of 2066636eea28f7522a1c51ac30

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Question 1 of 20

66636eea28f7522a1c51ac30

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🔍 Key Concepts

💭 Think About

✅ Before You Answer

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