On 16 January your 0930 ZT DR position is...

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Question 1 of 2066636eea28f7522a1c51ab11

On 16 January your 0930 ZT DR position is LAT 26°07.0'S, LONG 51°43.0'E. Your vessel is on course 238°T at a speed of 17.0 knots. What is the ZT of local apparent noon (LAN)?

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Question 1 of 20

66636eea28f7522a1c51ab11

On 16 January your 0930 ZT DR position is LAT 26°07.0'S, LONG 51°43.0'E. Your vessel is on course 238°T at a speed of 17.0 knots. What is the ZT of local apparent noon (LAN)?

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🔍 Key Concepts

• Local apparent noon (LAN) occurs when the Sun is on your local meridian (your longitude). • How to convert the difference in longitude between your DR position and the assumed longitude of the Sun at GHA ≈ 0° (i.e., when the Sun is on the prime meridian) into time. • How your vessel’s speed and course affect your DR longitude at the estimated time of LAN.

💭 Think About

• From the DR at 0930 ZT, estimate how far in longitude you will travel by the time you expect LAN, given your course and speed. Is most of your motion changing latitude or longitude? • Remember that 15° of longitude corresponds to 1 hour of time. Use this relationship to estimate how many minutes after (or before) 1200 ZT your LAN will occur. • Think about whether you are east or west of the reference meridian for your zone time. Will LAN occur earlier or later than 1200 ZT for your location?

✅ Before You Answer

• Be sure you convert speed in knots to distance run in the relevant fraction of an hour before adjusting the DR position. • Confirm whether your course 238°T changes longitude significantly in the time between 0930 and your guessed LAN time (use basic right-triangle components N–S and E–W). • Double-check that you apply the 15° = 1 hour relationship with the correct sign: east longitudes give LAN before 1200 ZT of that zone, west longitudes after.

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Question 1 of 2066636eea28f7522a1c51ab11

On 16 January your 0930 ZT DR position is LAT 26°07.0'S, LONG 51°43.0'E. Your vessel is on course 238°T at a speed of 17.0 knots. What is the ZT of local apparent noon (LAN)?

Back

Question 1 of 20

66636eea28f7522a1c51ab11

On 16 January your 0930 ZT DR position is LAT 26°07.0'S, LONG 51°43.0'E. Your vessel is on course 238°T at a speed of 17.0 knots. What is the ZT of local apparent noon (LAN)?

No comments yet

Be the first to share your thoughts!

If the question has a related picture, it will appear here.

🔍 Key Concepts

💭 Think About

✅ Before You Answer

👋 Hi! I'm Genie, your AI study assistant. How can I help you with this question?

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