SPECIMEN EXAMINATION 



FOR 



CHIEF MATE 



1. LATITUDE BY POLARIS. 



On 1 September 1958, in D. R. Longi- 

 tude 51°-06' West, Polaris was observed 

 at evening twilight to have a sextant al- 

 titude of 47°-30' and a bearing of 

 359°. 5 by gyro-compass. The chronom- 

 eter read 10h-45m-24s. The chronome- 



ter was lm25s fast. The sextant index 

 error was 1'.5 off the arc. The height 

 of eye was 25 feet. 

 Required : 



The Latitude at time at sight. 



The gyro-compass error. 



3. FIX OR RUNNING FIX. 



Enroute from Spain to Milwaukee, in bodies were observed. Given the follow- 



D. R. Latitude 46°-10' North and Longi- ing information on the celestial bodies, 



tude 26°-05' West, three (3) celestial determine the ship's position. 



Body Observed Altitude Greenwich Hour Angle Declination 



SATURN 19°-24'.9 60°-07'.8 17°-30'.5 S. 



MOON (L.L.) 13°-19'.9 321°-49'.2 05°-45'.2 S. 



ARCTURUS 37°-29'.4 441°-34'.9 19°-24'.6N. 



Candidates may use any method of 

 solution. 



The following 3 sextant altitudes of 

 planets were obtained on 2 March 1958. 

 The height of eye was 57 feet, the sex- 



Venua 

 Observation #1 



Planet sext. alt 2°-09'.6 



Bar. pressure 30.5 in. 



Temperature 80° F. 



Required: The observed altitudes. 



tant index error was 2'.0 on the arc in 

 all observations. Given : 



The following 3 sextant altitudes of 

 stars were obtained. The height of eye 

 was 64 feet; the sextant index error was 



Star sext. alt.. 

 Bar. pressure- 

 Temperature - 



Required: The observed altitudes. 



2'.5 off the arc in all observations. 

 Given : 



61 



