On 26 February your vessel's 1615 ZT DR...

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Question 1 of 2066636eea28f7522a1c51ada6

On 26 February your vessel's 1615 ZT DR position is LAT 25° 14' S, LONG 57° 22' W, when an azimuth of the Sun is observed. The chronometer time of the sight is 8h 13m 19s, and the Sun is bearing 266.0° per standard magnetic compass. The chronometer error is 01m 46s slow, and the variation in the area is 6° E. What is the deviation of the standard compass?

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🔍 Key Concepts

• Azimuth of the Sun to find compass error (difference between true bearing and compass bearing) • Relationship among true bearing, variation, deviation, and compass bearing (T–V–M–D–C ladder) • Use of chronometer time and GHA/Dec to compute the true azimuth (Zn) of the Sun at the time and position of observation

💭 Think About

• How do you convert the chronometer reading and its error into the correct UTC to use with the Nautical Almanac? • Once you have the Sun’s GHA and Dec at the correct time, how do you find the true azimuth (Zn) at the DR latitude and longitude? • After getting the true bearing, how do you step through T–V–M–D–C to isolate deviation from the known variation and observed compass bearing?

✅ Before You Answer

• Be sure you are using the correct sign for chronometer error (slow vs fast) when finding UTC. • Confirm the sign of variation (6° E) and how it affects the step from true to magnetic. • Double‑check that you are comparing the correct true azimuth (from sight reduction) with the observed standard magnetic compass bearing of the Sun (266.0°) before solving for deviation.

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