On 5 May your 1600 zone time DR position is...

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Question 1 of 2066636eea28f7522a1c51ae28

On 5 May your 1600 zone time DR position is LAT 17°28' S, LONG 143°39' E. You are on course 316°T at a speed of 17 knots. You observed 3 celestial bodies. Determine the latitude and longitude of your 1800 running fix. Body Zone Time GHA Observed Declination Altitude Avoir 1727 209°18.2' 47°24.4' S 59°27.3' Regulus 1732 184°14.7' 46°35.2' N 12°03.6' Betelgeuse 1738 249°03.6' 49°41.5' N 7°24.1'

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Question 1 of 20

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🔍 Key Concepts

• Running fix with multiple celestial bodies and advancing lines of position (LOPs) to a common time • Converting zone time to GMT (UT) and using GHA/Dec with your DR position to get assumed positions • Effect of course and speed from 1600 to each sight time and then to 1800 on the DR track and advanced LOPs

💭 Think About

• From the 1600 DR, what is your DR position at each sight time and again at 1800, given course 316°T and speed 17 knots? • How do you take an LOP from each observed altitude and then correctly advance or retire those LOPs so that all three intersect at 1800? • Looking at the answer choices, which positions lie reasonably close to your 1800 DR and in the correct relative direction (left/right of track and ahead/astern) compared with how your LOPs should cut the track?

✅ Before You Answer

• Verify the time intervals: 1600–1727, 1600–1732, 1600–1738, and 1600–1800, and convert minutes to decimal hours correctly. • Check that the distance run at 17 knots for each time interval is computed and applied along 316°T correctly (use ( \text{Distance} = \text{Speed} \times \text{Time} )). • Before picking an answer, compare its latitude/longitude to your computed 1800 DR position and ask: does the fix sensibly reflect the likely cross-track error and along-track error from intersecting three star LOPs?

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