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The Automatic Direction Finder uses a transmitter and aerial on the ground , an NDB (Non Directional Beacon) that allows the ADF instrument to point to the aerial that is tuned at a specified frequency . So, no matter what direction you are travelling in , the main part of the needle points to the Actual Radio Aerial Position . | The Automatic Direction Finder uses a transmitter and aerial on the ground , an NDB (Non Directional Beacon) that allows the ADF instrument to point to the aerial that is tuned at a specified frequency . So, no matter what direction you are travelling in , the main part of the needle points to the Actual Radio Aerial Position . | ||
The current should read 280 | In the RMI (Radio Magnetic Indicator) we can select a plain ADF frequency or the more information rich VOR signal, which is similar but has more information. It points to a selected direction 0-360 to the beacon too which you are heading , once the needle is pointing at twelve o' clock or straight forward toward your selected VOR ( vor = Vhf (very high frequency) Omnidirectional Range-finder )you can press F12 and enter your current heading plus or minus 180, in the '''Radial Box Input''' on the Nav 1 line . | ||
The current setting in that input box should read 280 , change that to the heading you are on when the needle is pointing forward '''ie 12 O' Clock ''' plus or minus 180 degrees . | |||
A radial is the direction in degrees '''FROM''' the actual vor aerial . | |||
(On the '''Green Needle''' there is often "middle" portion that moves from side to side , which tells you , how close , or far away , you are from your Desired Course . This part of the needle is called the CDI (Course Deviation Indicator)...if you are not too badly off course you can steer '''AWAY''' or to the opposite side indicated , to bring it to the center this will indicate | |||
you are '''On The Radial''' , you have selected . | |||
'''All of these instruments are combined in the left screen of the 777-200ER ''' | '''All of these instruments are combined in the left screen of the 777-200ER ''' |
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