INTERNATIONAL AND INLAND RULES OF THE ROAD 



117 



What lights are shown by vessels 

 aground in inland water? 



What are the lights for seagoing 

 steam vessels in inland waters? 



Where do the Pilot Rules apply? 



What is meant by the "danger" sig- 

 nal? 



What lights and day signals are dis- 

 played in inland waters by a surveying 

 vessel of the Coast and Geodetic Survey 

 at anchor in a fairway on surveying 

 operations? 



What is the fog signal for a steam 

 vessel underway? 



Of what duration are the blasts of 

 the whistle which are used as passing 

 signals? 



What signal shall be given by steam 

 vessels when moving from their docks 

 or berths and other vessels are liable 

 to pass from any direction toward 

 them? 



What is the rule in regard to sailing 

 in a narrow channel? 



Describe the lights and day signals 

 required to be shown by a fishing vessel 

 underway with her nets or lines in the 

 water. 



What are the day and night signals 

 to be carried by a steamer when towing 

 a submerged, or partly submerged, ob- 

 ject when no signals are displayed upon 

 the object towed? 



What signal must a steamer give in 

 addition to the one long blast when 



backing out of her berth with other 

 vessels in sight? 



What is the rule governing lights for 

 barges, canal boats, scows, and other 

 nondescript vessels temporarily operat- 

 ing on waters requiring different lights 

 from those of their customary route? 



What navigation lights are required 

 by motorboats when propelled by sail 

 and machinery or by sail alone? 



What lights are required by fishing 

 vessels of less than ten gross tons when 

 underway and when not having their 

 nets, trawls, dredges or lines in the 

 water? 



Under what circumstances should the 

 inland danger signal be used in fog? 



Your steamer is being overtaken by 

 another steamer which blows one short 

 blast. You regard it as dangerous to 

 comply with the overtaking steamer's 

 request but are willing to allow him to 

 pass you on your poii; side. What sig- 

 nals would you sound to indicate this? 



Describe the day and night signals 

 for self-propelled dredges under way 

 with suctions on the bottom. 



What are the whistle signals for a 

 vessel moving from her dock or berth 

 when other vessels are liable to pass 

 toward her? 



What navigating lights would be re- 

 quired on self-propelled dredges which 

 are proceeding to or from a dredging 

 site? 



RADAR 



Define and state the cause of: 



(a) Super-Refraction 



(b) Sub-Refraction 



How may radar be used for short 

 range weather predictions? 



What weather phenomena are detect- 

 able by radar? 



State the precautions necessary when 

 using the sea-return suppressor or anti- 

 clutter device. 



How can heavy rolling influence de- 

 tection of targets by radar? 



Is the relative bearing or the true 

 bearing presentation best for clarity of 

 presentation on the PPI scope? State 

 reasons for your answer. 



How can radar blind spots be located? 



What measures may be taken to mini- 

 mize dangers from blind spots? 



How was the name "radar" derived? 



Explain briefly in non-technical terms 

 the principle upon which radar is based. 



What are the elements of a radar in- 

 stallation that affect its range? 



OBSERVER 



Name the principal components of a 

 marine radar installation and briefly in 

 non-technical terms, describe their func- 

 tions. 



In basic terms, what is radar? 



What is meant by the term "bearing 

 resolution" when applied to radar? On 

 what does bearing resolution depend? 



What is resolution in range? On what 

 does resolution in range depend? 



What are relative bearings as seen 

 on a radar PPI scope? 



What are true bearings as seen on a 

 PPI scope? How is the course of the ves- 

 sel usually indicated when using true 

 bearings? 



What range scale would you use in 

 the open sea? What scale would you use 

 to make a landfall? What scale would 

 you use in a crowded channel? 



What precautions should be observed 

 during poor visibility if the radar scope 

 shows heavy sea return? 



