On 30 July your 1030 ZT DR position is LAT...

Question 1 / 2066636eea28f7522a1c51ae08

Question 1 of 2066636eea28f7522a1c51ae08

On 30 July your 1030 ZT DR position is LAT 19° 02' N, LONG 138° 12' W. You are on course 309° T, speed 24 knots. Determine your 1200 position using the following observations of the Sun. Zone Time GHA Declination Ho 1220 138°25.0' N 18°22.3' 88°43.3' 1226 139°55.0' N 18°22.2' 88°24.0'

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🔍 Key Concepts

• Dead reckoning (DR) track from 1030 to the two sight times and to 1200 • How to use two Sun sights near local apparent noon (LAN) to refine latitude and longitude • Transferring a line of position (LOP) (or LAN fix) to a desired time along the DR track

💭 Think About

• First, work out where your DR position would be at 1200 based on your course and speed. How far do you travel in 1 hour 30 minutes at 24 knots? • At each sight time, you have GHA and declination. How do you combine these with your assumed longitude to get Local Hour Angle (LHA) and then compute an intercept and azimuth? • Once you get a position from the Sun sights near noon, how do you "run" that position along your course and speed to find where you were at 1200?

✅ Before You Answer

• Make sure your time intervals (1030 → 1200, 1030 → 1220, 1030 → 1226) are correct and in hours and minutes before converting to distance at 24 knots. • Check your sign conventions: for west longitude, verify whether you use LHA = GHA − LONG or LHA = GHA + LONG, and keep everything between 0° and 360°. • After obtaining a position from the sights, be sure you transfer it correctly along course 309° T: verify distance run = speed × time and apply the correct course to change both latitude and longitude.

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Question 1 of 20

LAT 19° 28.0' N, LONG 138° 35.2' W

LAT 19° 29.7' N, LONG 138° 42.0' W

LAT 19° 32.6' N, LONG 138° 49.4' W

LAT 19° 34.5' N, LONG 138° 40.9' W

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Question 1 / 2066636eea28f7522a1c51ae08

Question 1 of 2066636eea28f7522a1c51ae08

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Question 1 of 20

66636eea28f7522a1c51ae08

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🔍 Key Concepts

💭 Think About

✅ Before You Answer

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