GMDSS英语【二三副】
考试试题
[问答题]DSC uses a DIGITAL signal to send a specific set of information.The information that can be passed by a DSC call includes:
①The caller’s MMSI(a number that uniquely identifies that caller,similar to a phone number).
②The MMSI of the unit being called.This can be a specific unit or a group of units(for example,all Coast Guard units).
③The caller’s location,and time of location.This can be derived directly from an interface to a GPS/SatNav receiver,or it can be entered manually.Location and time of location are normally only transmitted with a distress alert.
④The requested working frequency and mode.This is the frequency and mode of emissions that will be used to transact business.DSC is only used for call set-up.
Once the call is established the two parties change to a working frequency and mode to continue the call.
⑤The priority of call (Distress,Urgent,Safety,Rountine).DSC can be used for anything from distress calls,to setting up a routine phone patch through a commercial coast station.
⑥For distress calls,the DSC call can even indicate the type of emergency(fire,flooding,ect).
