Emergency Navigation Quiz
This quiz covers navigation scenarios involving vessel courses, coordinates, celestial sightings, and terrestrial positioning. Test your emergency navigation skills in various situations and learn how to determine latitude and longitude accurately.
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Presentation Transcript
Emergency Navigation Quiz Global Navigation Chapter 7 1
Question 1 A vessel travels 30nm on course 045 from L30 32' N, Lo 40 43' W. What is the approximate latitude and longitude at the point of arrival? R ponse : L30 53 N, Lo040 20 W 2
Question 2 29 october GHA Aries 1500 hour 29 october Since your latitude = Sirius declination, your latitude is Sirius at the time of the sighting: longitude is approximately Lo165 41,3 W. 263 16,6 3 45,1 At UT 15-14-58 on 29 October 20XX, you identify Sirius directly overhead. What is your position? and longitude, convert Sirius celestial coordinates for that date and time to terrestrial coordinates. UT 15-14-58 29 october Solution: Since Sirius is directly overhead, you are at GP of the body. To find your latitude 16 43,0 S. GHA Sirius = GHA (Aries) + SHA (Arcturus) SHA Sirius Sub-total From the Nautical Almanac, you find that the SHA Sirius is 258 39,6 , and its declination is approximately L16 43,0 S. GHA Aries 15-14-58 267 01,7 To obtain longitude, calculate the GHA 14 m 58 s Since GHA<180 , GHA = Lo W, so your 258 39,6 525 41,3 - 360 165 41,3 Answer : L16 43,0 , Lo165 41,3 W. GHA Sirius 3
Emergency Navigation Quiz End of Global Navigation Chapter 7 4
