36 



UNITED STATES COAST GUARD 



BLACK 



hhite 



a. On irtiich side voiild you leave this buoy 

 in passing? 



b. What n\iinber WDuld such a buoy have? 



c. What color lijjht viould the buoy display? 



d. What phase characteristics vould the li^t 

 of this buoy have? 



e. How wovild this buoy be indicated on a chart? 



Entering from seaward you sight the 

 black and white vertically striped light- 

 ed buoy illustrated above. 



How are bearings relating to sectors 

 of visibility of lights stated in light 

 lists? 



What are the standard light colors 

 used for lighted aids to navigation? 



What do colored sectors in lights 

 mark? 



How is the power of a light expressed 

 in the light list? 



How would you determine if the 

 visibility given for a light is the geo- 

 graphic or luminous range? 



Describe the effect of atmospheric re- 

 fraction on the visibility of navigational 

 aids. 



In entering a United States port the 

 black lighted buoy is sighted as shown 

 below : 



BUCK 



a. On what side should it be left in passlj^? 



b. What type nunber would it have? 



c. What color light would it Aow? 



d. How would this buoy be indicated on a chart? 



e. What phase characteristics would this ll^t have? 



15. INSTRUMENTS AND ACCESSORIES. 



How would you clean the arc of a 

 sextant? 



What is the purpose of the mercury 

 ballistic wicks on the master gyro-com- 

 pass? 



Why are corrections for latitude, 

 height and temperature applied to a 



mercurial barometer? 



Describe in detail the procedure of 

 stopping the gyro-compass. 



What routine inspection of the gyro- 

 compass should be made each watch at 

 sea? State briefly what you would 

 check? 



