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Ship  Control  Console
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FFG-7 Class Ship Control Console
Figure 2-12.— DD-963 ship control console. use aboard ships today. As you can see from these illustrations, the physical appearance may differ from ship type to ship type. Steering  Control  Console The steering control console (fig. 2-14) is used in conjunction with the ship control console. It includes the  rudder  angle  order  indicator-transmitter,  helm  angle indicator,  ship's  course  indicator,  course-to-steer indicator, magnetic compass repeater, and emergency steering  switch. FATHOMETER Ships are equipped with a sonic fathometer, whose principle of operation is based upon the fact that sound travels through water at about 4,800 feet per second. The fathometer sends out a signal, which bounces off the ocean floor and returns to the ship much like an echo. Obviously, half of the time (in seconds) required for the sound to make the round trip, times 4,800 is the distance to the bottom, in feet. The set includes a compact receiver-transmitter unit in the charthouse, and a transducer on the bottom of the ship. In spite of its small size, the fathometer gives a very accurate reading at a wide range of depths, from about 5 feet to 6,000 fathoms. It is designed for use on both submarines and surface vessels. NAVIGATIONAL  LIGHTS LEARNING OBJECTIVE: List and explain the purpose of the navigation lights aboard ship. The navigational lights installed on naval vessels must  be  in  accordance  with  Navigation  Rules, International-Inland,  COMDTINST  M16672.2B,  or  as allowed by an existing waiver or a waiver to be issued covering a vessel being built. These lights consist of (1) running lights, (2) signal lights, and (3) anchor lights. Figure  2-15  shows  navigational  lights  onboard  a  vessel underway. RUNNING LIGHTS Running lights of naval ships are similar to those used  on  merchant  ships.  They  include  the  (1)  masthead light, (2) second masthead light (range light), (3) port and starboard side lights, and (4) stem light (white). Some  of  these  running  lights  are  illustrated  in figure  2-16. The masthead light is a white light (fig. 2-16, view A) located on the foremast or in the forward part of the ship, between 6 and 12 meters above the deck. It has a spraytight fixture and is equipped with an inboard shield to show an unbroken light over an arc of the horizon of 225°; that is, from right ahead to 22.5° abaft the beam on either side. 2-10

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