On 19 September your 0300 zone time DR...

Question 1 / 2066636eea28f7522a1c51abdb

Question 1 of 2066636eea28f7522a1c51abdb

On 19 September your 0300 zone time DR position is LAT 24° 35' N, LONG 88° 40' W. You are on course 288° T at a speed of 14 knots. You observed 3 celestial bodies. Determine the latitude and longitude of your 0600 running fix. ZONE OBSERVED BODY TIME GHA ALTITUDE (Ho) DECLINATION ------------------- -------- ------------- ------------ --------------- Regulus 0530 018° 56.5' 22° 45.2' N 12° 03.6' Sirius 0532 070° 12.2' 44° 30.6' S 16° 41.3' Hamal 0536 140° 44.1' 43° 16.5' N 23° 22.5'

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🔍 Key Concepts

• Dead reckoning (DR) track from 0300 to the times of each sight, then to 0600 • How a running fix uses Lines of Position (LOPs) advanced along track to a common time • Effect of course and speed (288° T at 14 knots) on both latitude and longitude over 3 hours

💭 Think About

• First, compute the DR position at 0600 from the 0300 DR using course and speed. How far west and north should you have moved in 3 hours on 288° T at 14 knots? • Compare your approximate 0600 DR with each answer choice. Which options are clearly too far off track in latitude or longitude to be realistic? • Think about whether the running fix from 3 well-spread stars is likely to move you closer to, or farther from, the DR track—would it create a huge change in longitude or only a modest correction?

✅ Before You Answer

• Be sure you correctly convert 3 hours at 14 knots into distance run in nautical miles • Check the change in latitude and change in longitude implied by your DR run and by each answer choice; eliminate any that require an unrealistically large shift from DR • Verify that your chosen option lies reasonably close to the projected DR position at 0600, not far away from your expected track

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Question 1 of 20

LAT 24° 47.4' N, LONG 89° 15.0' W

LAT 24° 52.5' N, LONG 89° 22.4' W

LAT 24° 59.5' N, LONG 89° 28.6' W

LAT 25° 06.0' N, LONG 90° 37.0' W

Question 1 / 2066636eea28f7522a1c51abdb

Question 1 of 2066636eea28f7522a1c51abdb

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Question 1 of 20

66636eea28f7522a1c51abdb

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🔍 Key Concepts

💭 Think About

✅ Before You Answer

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