The identification character of each Navtex station is regarded as（）to the messages.

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  A . When at anchor，the pilot vessel is only required to sound anchor signals B . The identification signal must be sounded any time the pilot vessel is underway C . The pilot vessel may only sound the identity signal when making way D . All of the above

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• The official identification of a vessel is found in the （）.

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• When may the automatic identification system (AIS) be switched off? （）

  A . At anytime as long as it is properly logged B . At the Master's professional judgment C . Only when the vessel is at anchor or in port D . Under no circumstance

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• Which of the following statements is TRUE regarding automatic identification systems (AIS)? （）

  A . AIS is a short-range VHF-FM system that automatically broadcasts a vessel's position，course，speed and other safety related information to all those with similar equipment in the area B . AIS is a one-way centrally managed system that requires the local VTS to send commands to instruct each vessel to broadcast position，course，speed and other safety related information to all those with similar equipment in the area C . AIS is a global tracking system that relies upon INMARSAT C service to communicate vessel position，course，speed and other safety related information to all those with similar equipment in the area D . AIS is a short-range 3 cm X-band radar system that automatically sends a vessel's position，course，speed and other safety related information to all those with similar equipment within the area

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• Which of the following statements is TRUE regarding automatic identification systems (AIS) ? （）

  A . AIS may be used to make passing arrangements via ship-to-ship text messaging thus relieving a vessel operator from sounding whistle signals or making contact via radiotelephone B . AIS may be used to make passing arrangements via ship-to-ship text messaging but a vessel operator is still required to sound whistle signals unless the arrangement is made via radiotelephone C . AIS cannot be used to make passing arrangements because the system does not have the ability to communicate from ship-to-ship in this manner D . AIS cannot be used to make passing arrangements because the use of the ship-to-ship text messaging feature in this way is prohibited

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• Navtex transmitter identification character（）is used to identify the broadcasts which are to be accepted by the receiver and those are to be rejected.

  A . B2 B . B1 C . MAR D . NNN

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• Automatic identification systems (AIS) are expected to broadcast all of the following information EXCEPT（）.

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• Which of the following statements is TRUE regarding automatic identification systems (AIS) ?（）

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