On 16 November your 0800 zone time DR...

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Question 1 of 2066636eea28f7522a1c51ab1f

On 16 November your 0800 zone time DR position is LAT 25°11.0'N, LONG 117°41.0'W. Your vessel is on course 252°T at a speed of 14.5 knots. What is the zone time of local apparent noon (LAN)?

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Question 1 of 20

66636eea28f7522a1c51ab1f

On 16 November your 0800 zone time DR position is LAT 25°11.0'N, LONG 117°41.0'W. Your vessel is on course 252°T at a speed of 14.5 knots. What is the zone time of local apparent noon (LAN)?

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🔍 Key Concepts

• Local Apparent Noon (LAN) occurs when the Sun is on your meridian (your longitude). • How to find the DR longitude at LAN using course, speed, and time from 0800 to LAN. • Relationship between time and longitude: 15° of longitude = 1 hour of time (so 1° = 4 minutes).

💭 Think About

• From 0800, you don’t know LAN yet, so think: how can you express the unknown time to LAN in hours, and then use that to compute how far you move along track? • Once you have a formula for your DR longitude as a function of time, what condition must be true at LAN about your longitude and the Sun? • Which choice (1131, 1135, 1139, 1144) makes your computed DR longitude at that time line up best with the expected longitude for LAN based on 4 minutes of time per degree of longitude?

✅ Before You Answer

• Be sure you are using DR longitude at LAN, not the 0800 longitude, when deciding the time of LAN. • Convert time difference to hours and tenths of hours before multiplying by 14.5 knots to get distance made good. • When converting distance made good on course 252°T into a change in longitude, check your difference of longitude sign (are you moving east or west?).

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Question 1 of 2066636eea28f7522a1c51ab1f

On 16 November your 0800 zone time DR position is LAT 25°11.0'N, LONG 117°41.0'W. Your vessel is on course 252°T at a speed of 14.5 knots. What is the zone time of local apparent noon (LAN)?

Back

Question 1 of 20

66636eea28f7522a1c51ab1f

On 16 November your 0800 zone time DR position is LAT 25°11.0'N, LONG 117°41.0'W. Your vessel is on course 252°T at a speed of 14.5 knots. What is the zone time 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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