UNITED STATES COAST GUARD 



6. COMPASS DEVIATION. 



Enroute from New York to Rio de 

 Janeiro, in D. R. Latitude 9°-16' South 

 and Longitude 32°-02' West, an azi- 

 muth of the sun was observed. 



The following data was recorded at 

 the time of observation : 



Variation for the locality was 21 "-30' 

 We.st. 

 Required: 



The true azimuth. 



The deviation of the standard com- 



pass. 



Greenwich Hour Angle 



75°-39'.l 



Compass Bearing of Sun 



273°-00' psc 

 Candidates may use any method of solution 



Declination of Sun 



21''-02'.0 S. 



8. MIDDLE LATITUDE SAILING. 



By middle latitude sailing, find the 

 true course and distance from Gedney 

 Channel lighted whistle buoy in Lati- 

 tude 40°-28'.8 North and Longitude 



73°-53'.7 West, to Nantucket Shoals 

 Lightship, in Latitude 40''-37' North 

 and Longitude 69 "-37'.! West. Show all 

 work. 



11. PILOTING. 



A vessel is heading 205°. At first 

 bearing, a light bears 241° and the log 

 reads 87 miles. At second bearing, the 

 same light bears 258° and the log reads 

 98 miles. What is the distance off at 

 time of second beaiing and when 

 abeam ? 



Your course is 255° p.s.c, variation 

 23° East, deviation 2° East. A light is 

 sighted bearing 255° True. On what 

 compass bearing must the light be ob- 

 served such that the run between bear- 

 ings would equal your distance off when 

 abeam? 



Compass course is North, speed 10 

 knots, and the first bearing of a light 

 ashore is 26%° on the bow at 10:10 



a.m. At 10:52 a.m., the same light bears 

 45° on the bow. Give the distance the 

 vessel will pass off the light when 

 abeam, 



A vessel steering 10° picks up a shore 

 light bearing 30°, log reading 45 miles. 

 Later the same light bore 75°, log 

 reading 56 miles. What is the distance 

 off when abeam? 



A vessel is steering North, speed 10 

 knots, and a bearing is taken of a light 

 2 points on the bow at 0800. At 0900, 

 the same light bears four points on the 

 bow. How far will the ship pass off the 

 light when abeam on the same course 

 and at what time will she be abeam? 



Note: Problems may be given pertaining to piloting which are under other titles in this book. 



