🔍 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.