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For example, for persons in the water, using .-nautical mile track spacing, the limit should be 1/8 nautical mile or approximately 250 yards.  For life rafts, the limit should be 2.5 nautical miles or less, and for boats under 60 feet in length, 10 nautical miles or less, even though the horizon may be over 25 nautical miles distant for an aircraft at 500 feet altitude.  Thus, for small objects, even under optimum conditions, no search should be made above 10 degrees below the horizon and for rafts, no more than 2 degrees below the horizon.  For boats up to 60 feet, the scan will extend virtually to the horizon.  If the meteorological visibility is less than optimum, these distances should be further reduced.
 

 
 
Section D. Vessel Recognition

 
Introduction
 This section briefly describes the importance of vessel identification and provides a number of pictorials to aid in vessel recognition.
 
D.1.  Vessel Identification
 Knowledge of various vessel types and configurations is important.  To provide accurate reporting, it is critical that the vessel be identified and described properly by the reporting aircraft.  Most Auxiliarists acquire a working knowledge of the plan view of various surface craft through public education courses, member training, and experience on the local waters.  (see Figure 4-4 through Figure 4-9)
 
Small Sailing Vessels

 
 
Large Sailing Vessels
 
 
Figure 4-5 Large Sailing Vessels
 
Powered Vessels

 
High Performance Powered Vessel

 
 
 

Commercial Vessels

 
 

 
 

25' Transportable Port Security Boat (TPSB)

 25' Transportable Port Security Boat/
Raider Boat (TPSB)

 
 
27' Guardian Smallboat

 38' Deployable Pursuit Boat (DPB)

 
 
 
Motor Surf Boat (MSB)

 Rigid Hull Inflatable Boat (RHIB)

 
 
 

Response Boat (RB)
(several types including Defender Class)

 41' Utility Boat (UTB)

 
 
47' Motor Lifeboat (MLB)

 
 
 
49' Buoy Utility Stern Loading (BUSL)

 55' ATON Boat (ANB)

 
 
 

 
  
 

 
65' Small Harbor Tug (WYTL)

 140' Icebreaking Tug (WTGB)

 
 
 
290' Inland Icebreaker (WAGB)

 399' Polar Class Icebreaker (WAGB)

 
 
 

 
 
65' River Buoy Tender (WLR)
　
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