On 11 December your 1816 ZT DR position is...

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Question 1 of 2066636eea28f7522a1c51aa15

On 11 December your 1816 ZT DR position is LAT 26° 30.0' N, LONG 140° 35.0' E. At that time, you observe Venus bearing 230° pgc. The chronometer reads 09h 14m 52s and the chronometer error is 01m 02s slow. The variation is 3.5° E. What is the gyro error?

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🔍 Key Concepts

• Gyro error relationship: True bearing vs. gyro bearing • Use of variation to relate true and magnetic directions • How to get the true bearing of Venus from sight reduction or Nautical Almanac data at the given time and position

💭 Think About

• How do you normally express gyro error? (Think: G-E-T or T-V-M-G type memory aids.) Which side (east or west) is gyro if it reads higher or lower than true? • From the DR position, date, and time, what is the approximate true azimuth (true bearing) of Venus, and how does it compare with the observed 230° pgc? • Once you have the true bearing, how do you step through variation (and any deviation if needed) to compare it correctly with gyro?

✅ Before You Answer

• Be sure your chronometer correction (slow vs fast) is applied correctly to get the correct UTC before finding Venus’ azimuth. • Confirm you’ve used the correct zone description (time zone offset) to convert 1816 ZT to UTC. • Double-check your east/west sign convention for gyro error: decide whether ‘gyro high’ or ‘gyro low’ corresponds to east or west error before choosing an answer.

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