DSC_QuickStartGuide用户使用操作说明书手册

COMCLASS D DSCOPERATION GUIDE■WHAT IS DSCDSC CALLS ARE SELECTIVEDSC stands for "Digital Selective Calling"and is a semi-automat-There are four types of calls.ed method of establishing a radio call;it has been designated bythe International Maritime Organization(IMO)as an international1.DSC calls can be addressed to a certain user,often referredstandard for maritime MF.HF.and VHF radio distress calls.It isto as individual callspart of the Global Maritime Distress and Safety System(GMDSS).2.DSC calls can be addressed to a set of users,often referredDSC may eventually replace aural watches on distress frequen-to as group callscies and will be used to announce routine and urgent calls,anddistress alerts.DSC callouts may precede maritime safety3.DSC calls can be addressed to a specific geographic areainformation broadcasts.4.DSC calls can be addressed to all ships and shore stationsoften referred to as Distress Alerts■HOW DOES DSC WORKOnce a DSC call is received,the receiving station will use DSCDSC uses a digital signal to send a specific set of information.To have it work,you need the following:protocol to acknowledge the call.At this point,the parties willmove to a working frequency or channel.The vessel must be equipped with DSC capable radio.It isbest to have a Class D DSC radio as the new USCGDo not acknowledge distress calls.Doing so will turn off theregulations require.distress alert information from the other vessel.Allow a shoreYou must obtain a MMSI #(Maritime Mobile Service ldentitystation to respond.If the shore station does not respond withinNumber)for your DSC radio from Boatus.com.This is howFIVE minutes,use the "relay"function of the radio to forward theothers can identify it is you making the DSC call.distress call to the USCG MMSI 003669999.You must connect the DSC radio to a Global Positioning■THE ADVANTAGES OF DSCSystem(GPS)in order for yourposition to be sent with theDSC distress call.Interconnect your radio to a GPS receiverDSC gives priority to Distress Alerts and can send your positionusing a two-wire NMEA 0183 interface that is on all DSC-ONLY IF YOUR RADIOIS CONNECTED TO YOUR GPS.CON-NECTING YOUR RADIO AND GPS CAN SAVE YOUR LIFE!equipped marine radios and on most GPS receivers.Referto your GPS manual for instructions and the USCG web site forIn non-emergency situations,boaters with DSC radios can hailupdates:www.navcen.uscg.gov/?pageName=mtDsc.one another directly by punching in the unique,nine-digit MMSIThe system should be tested.To test the system,do NOTnumber of the vessel they wish to hail and make the call on DSCpress the distress button!You will need to determine theChannel 70MMSI number of a friend or local shore station or use theUSCG test MMSI when making a test call.To make a testDSC minimizes the time necessary to establish communications,call enter the MMSI #Use the DSC calling Channel 70.and because the initial call is made on Channel 70,this clears aSelect a working channel(NOT Channel 16),use a routinelot of