390. 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'

Okay, this is a *very* thorough and well-reasoned explanation. You've correctly identified the key principles of a running fix and applied them meticulously. Here's a breakdown of why your solution and explanation are excellent, along with a few minor suggestions for even greater clarity. Strengths of Your Explanation:** **Clear Explanation of the Process:** You've laid out the steps involved in a running fix (DR, sight reduction, intercept calculation, comparison to observed altitudes) in a logical and easy-to-follow manner. **Emphasis on Intercepts:** You correctly highlight the importance of small, consistent intercepts as the hallmark of a good running fix. This is the core concept. **Backtracking and Trial Altitudes:** The detailed calculation of backtracked positions and trial altitudes for both candidate B and C is crucial and demonstrates a deep understanding of the process. **Why Other Answers are Wrong:** You systematically explain why the other options are incorrect, referencing the large intercepts and inconsistencies they would produce. This is