On 9 November your 0400 DR position is LAT...

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Question 1 of 2066636eea28f7522a1c51ae65

On 9 November your 0400 DR position is LAT 18° 24.0' S, LONG 97° 36.0' W. You are on course 138° T at a speed of 16 knots. You observed 3 celestial bodies. Determine the latitude and longitude of your 0600 running fix. ZONE OBSERVED BODY TIME GHA ALTITUDE (Ho) DECLINATION ------------------- -------- ------------- ------------ --------------- Canopus 0510 120° 08.7' 51° 31.4' S 52° 40.9' Aldebaran 0512 147° 49.1' 29° 07.8' N 16° 28.4' Regulus 0514 065° 11.7' 45° 57.5' N 12° 03.5'

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Question 1 of 20

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🔍 Key Concepts

• Running fix with multiple celestial LOPs (Lines of Position) between 0510–0514 and advancing them to a common time (0600) • How to compute DR position at 0510–0514 from the 0400 DR using course and speed, then the DR at 0600 • Effect of your course 138° T and 16 knots on advancing the LOPs from each sight time to 0600

💭 Think About

• From 0400 to each sight time (0510, 0512, 0514), what is your DR position if you maintain 138° T at 16 knots? How far and in what direction have you traveled? • Once you obtain the three LOPs for Canopus, Aldebaran, and Regulus at their respective times, how do you advance those lines to 0600 to form a running fix? • Looking at the multiple-choice answers, which positions make sense given your track (138° T) from the 0400 DR – is your latitude increasing or decreasing, and is your longitude increasing or decreasing?

✅ Before You Answer

• Double-check the time intervals: 0400–0510, 0400–0512, 0400–0514, and 0400–0600, then convert minutes to hours correctly. • Verify the distance run using ( \text{Distance} = \text{Speed} \times \text{Time} ) in nautical miles along 138° T, and how that affects changes in latitude and longitude. • Check whether the final position choices are consistent with the expected general DR movement from 0400 to 0600 before applying any sight corrections.

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