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1 Altitude Corrections Quiz Q & A Junior Navigation Chapter 4

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2 1. Dip correction is the angular difference between the visible horizon and a true horizontal. a. True b. False

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3 2. A ship's captain takes a sight from the ship's rigging with a HE of 54 feet. His mate takes a sight from the deck of the ship with a HE of 18 feet. For which HE will the dip correction be greatest? HE of 54 feet

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4 3. Find the dip correction: HE Correction 18 ft ____ 22 ft____ 72 ft____ -4.1' -4.5' -8.2'

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5 4. For the following data, determine main sextant altitude corrections: Body Date ha Sun UL 21 June 17° 32.1' Sun LL 29 Sept 43° 46.0' Sun UL 29 Sept 43° 46.0' Sun LL 10 Mar 61° 41.6' Main - 18.8' +15.0' -16.8' +15.7'

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6 Altitude Corrections JN Quiz Chapter 4 Problem 5 Refraction is minimal for: a. daylight observations. b. low-altitude sights. c. star sights. d. high-altitude sights.

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7 Altitude Corrections JN Quiz Chapter 4 Problem 6 Parallax is minimal for: a. daylight observations. b. moon sights. c. star sights. d. sun lower-limb sights.

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8 Altitude Corrections JN Quiz Chapter 4 Problem 7 The main correction for an Sun LL sight is subtracted from ha. a. True b. False

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9 Altitude Corrections End of Quiz Q & A Junior Navigation Chapter 4

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Copyright © 2011, Elsevier Inc. All rights reserved. Chapter 6 Author: Julia Richards and R. Scott Hawley.

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