On 19 November your 0300 zone time DR...

Question 1 / 2066636eea28f7522a1c51abd8

Question 1 of 2066636eea28f7522a1c51abd8

On 19 November your 0300 zone time DR position is LAT 19° 23' N, LONG 151° 37' E. You are on course 293° T at a speed of 17 knots. You observed 3 celestial bodies. Determine the latitude and longitude of your 0600 running fix. Body Zone Time GHA Observed Altitude Declination Mars 0525 180°59.9' 60°05.5' N 07°05.2' Arcturus 0532 137°03.2' 22°39.0' N 19°16.7' Suhail 0537 215°10.4' 26°51.3' S 43°21.2'

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🔍 Key Concepts

• Running fix with celestial bodies: advancing earlier LOPs (lines of position) to a common time using course and speed • Dead reckoning (DR) track: computing the DR position at the time of each sight and at 0600 from the 0300 DR using course and speed • Intercept method (altitude intercept): comparing observed altitude (Ho) to computed altitude (Hc) to find toward/away intercepts and plotting them

💭 Think About

• How do you advance your 0300 DR position along course 293° T at 17 knots to find the DR positions at each sight time (0525, 0532, 0537) and at 0600? • Once you obtain three LOPs from Mars, Arcturus, and Suhail, how do you advance them to a common time (0600) and then find the running fix relative to your 0600 DR? • Looking at the multiple‑choice answers, how does your 0600 DR compare to each option, and which answer best matches the small expected offset between DR and running fix?

✅ Before You Answer

• Compute your 0600 DR position from the 0300 DR using course and speed before doing any sight reduction. • Be sure to apply time corrections correctly: convert zone times to GMT (UT) for each sight when entering the Nautical Almanac or sight reduction tables. • Confirm that each LOP has been properly advanced to 0600 along the track before determining the running fix latitude and longitude.

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Question 1 of 20

LAT 19° 38.5' N, LONG 150° 41.6' E

LAT 19° 34.8' N, LONG 150° 48.0' E

LAT 19° 32.9' N, LONG 150° 52.3' E

LAT 19° 30.5' N, LONG 150° 48.5' E

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Question 1 / 2066636eea28f7522a1c51abd8

Question 1 of 2066636eea28f7522a1c51abd8

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Question 1 of 20

66636eea28f7522a1c51abd8

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🔍 Key Concepts

💭 Think About

✅ Before You Answer

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