On 27 March your 0330 zone time DR position...

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Question 1 of 2066636eea28f7522a1c51adbd

On 27 March your 0330 zone time DR position is LAT 23° 32' N, LONG 154° 47' E. Your vessel is on a course of 105° T at a speed of 20 knots. What will be the zone time of sunrise at your vessel?

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66636eea28f7522a1c51adbd

On 27 March your 0330 zone time DR position is LAT 23° 32' N, LONG 154° 47' E. Your vessel is on a course of 105° T at a speed of 20 knots. What will be the zone time of sunrise at your vessel?

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🔍 Key Concepts

• Zone time vs GMT/UT: How to convert between local zone time and Greenwich Mean Time using longitude and time zones. • DR (Dead Reckoning) position at event time: How far the vessel moves between the given DR time and the expected sunrise time based on course and speed. • Nautical Almanac sunrise calculation: Using date, latitude, and longitude (or LMT – Local Mean Time) to find sunrise and then converting to zone time.

💭 Think About

• First, think about whether sunrise is found using your 0330 DR position or an estimated position at the time of sunrise. How would your movement affect the longitude used? • After you obtain sunrise time in GMT or LMT from the Nautical Almanac, what steps do you take to turn that into zone time for your longitude on 27 March? • Check how many minutes of time your vessel travels per degree of longitude at 20 knots on the given course. Does east‑west motion change the time of sunrise much in this short interval?

✅ Before You Answer

• Determine the correct time zone description (ZD) for LONG 154° 47' E and its sign convention (E vs W) before converting to or from GMT. • Be sure you are using the correct date (27 March) and correct latitude 23° 32' N when looking up sunrise in the Nautical Almanac. • After all conversions, compare the resulting time with 0330 to see if the answer is reasonable (sunrise should not be wildly earlier or later than typical tropical sunrise times).

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Question 1 of 2066636eea28f7522a1c51adbd

On 27 March your 0330 zone time DR position is LAT 23° 32' N, LONG 154° 47' E. Your vessel is on a course of 105° T at a speed of 20 knots. What will be the zone time of sunrise at your vessel?

Back

Question 1 of 20

66636eea28f7522a1c51adbd

On 27 March your 0330 zone time DR position is LAT 23° 32' N, LONG 154° 47' E. Your vessel is on a course of 105° T at a speed of 20 knots. What will be the zone time of sunrise at your vessel?

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

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