On 23 May your 0628 zone time position was...

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Question 1 of 2066636eea28f7522a1c51ad5f

On 23 May your 0628 zone time position was LAT 28°18.0'S, LONG 102°42.0'E. Your vessel was steaming on course 040°T at a speed of 20.0 knots. An observation of the Sun's lower limb was made at 0758 ZT. The chronometer read 01h 02m 06s and was fast 04m 04s. The observed altitude (Ho) was 13°16.7'. LAN occurred at 1201 zone time. The observed altitude (Ho) was 42°32.0'. What was the longitude of your 1201 zone time running fix?

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🔍 Key Concepts

• Running fix using a morning Sun line advanced to LAN • Converting zone time (ZT) to GMT (UT) using chronometer error • Effect of steaming on a constant course and speed on longitude change

💭 Think About

• How do you convert the 0758 ZT sight time to GMT using the given chronometer reading and error, and how does that help you find the Sun’s GHA (Greenwich Hour Angle) for the first line? • Once you have a position line from the 0758 sight, how do you advance it along your track (040°T at 20 knots) to the LAN time (1201 ZT) to form a running fix? • Between 0628 ZT, 0758 ZT, and 1201 ZT, how much time passes, what distance do you travel, and in what direction does that move your longitude?

✅ Before You Answer

• Be sure you are using the correct sign for chronometer error (fast vs. slow) when finding GMT. • Confirm you are advancing the first Sun line using the correct track (040°T) and distance run between the two sights. • Double-check how movement toward or away from the Sun’s GHA affects whether your longitude becomes larger (more easterly) or smaller (more westerly).

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