GMDSS普通操作员 第07讲：Passage 40 第07讲：Passage 40.ppt

航运系航海教研室 航运系航海教研室 航运系航海教研室 航运系航海教研室 航运系航海教研室 航运系航海教研室 航运系航海教研室 航运系航海教研室 航运系航海教研室 航运系航海教研室 Passage 40 To ensure that the user knows when to receive MSI for a given area and subject, many MSI broadcasts are scheduled, under IMO coordination, to a particular time, LES, and satellite. For example, all navigational warnings and meteorological forecasts are scheduled broadcasts (and given safety priority, which does not produce an alarm at the terminal when received), while meteorological warnings and distress alerts are unscheduled broadcasts (and given urgent or distress priority, which produces an alarm at the terminal). Passage 40 Before the actMty of receiving navigational warnings and meteorological forecasts, operators should consult Admiralty List of Radio Signals (ALRS) for the details. To ensure receiving a scheduled MSI broadcast, the receiver must be tuned to the appropriate channel/satellite at the specified time, and programmed to receive information for the area concerned. Passage 40 A smaller number of MSI messages are transmitted as unscheduled broadcasts, for example urgent navigational warnings, severe weather warnings, and distress alert relays. Un-scheduled SafetyNET broadcasts are made over all satellites covering an area, so the receiver will not miss the message, no matter what satellite it is logged-in to. The user is advised of the receipt of an unscheduled broadcast by the terminal gMng an alarm. Passage 40 1. What is the best title of the passage? - A. Unscheduled SafetyNET Broadcasts. B. Scheduled and Unscheduled MSI Broadcasts. C. Scheduled MSI Broadcasts. D. Unscheduled MSI Broadcasts. 正确答案：B Passage 40 2. What does the word scheduled mean? A. Designed. B. Planned. C. Organized. D. All of the above. 正确答案：D Passage 40 3. Which of the following should be broadcast in an unplanned way? A. All navigational warnings. B. Meteorological forecasts. C. Ice reports. D.