34 



UNITED STATES COAST GUARD 



6. COMPASS DEVIATION. 



Enroute from New York to Cape of 

 Good Hope in D. R. Latitude 31°-26' 

 North and Longitude 55°-17' West, an 



azimuth of the star 5 (Delta) Cyngi was 

 observed. The following data was ob- 

 tained at the time of observation: 



Compass Bearing of Star 



329°-00' psc 



Greenwich Hour Angle 



Declination of Star 



45°-01'.9 



Variation for the locality was 18 "-SO* 



West. 



Required: 



The time azimuth. 



The deviation of the standard com- 

 pass. 



Candidates may use any method of 

 solution. 



9. MERCATOR SAILING. 



By mercator sailing, find the true 

 course and the distance from Ambrose 

 Channel Lightship (Lat. 40°-27'.l 

 North and Long. 73''-49'.4 West) to a 



point in Lat. 32 "-22' North and 



Long. 64°-39'.0 West, off St. David 



Island Lighthouse, Bermuda. Show all 

 work. 



11. PILOTING. 



Running along the coast off a light- 

 house listed as 145 feet high. You meas- 

 ure its vertical sextant angle and find 

 it to be l°-3'. How far off the light- 

 house are you? 



Steaming south by gyro at a speed 

 of 12 knots, a lighthouse was observed 

 bearing 126°-00 by gyro. After a run 

 of 30 minutes the same lighthouse bore 

 100° by gyro. 



Required : 



Distance off at second bearing. 

 Distance off when abeam. 



A ship is steering 101° p.g.c, Varia- 

 tion 23° East, deviation 3° West, which 

 is 82° p.s.c. A light is sighted bearing 

 129° true. On what gyro bearing must 

 the light be observed so that the run 

 between bearings would equal the dis- 

 tance off the light when the light bears 

 191° gyro? 



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



