2.2 Urgency and Safety communications via DSC equipment


The meaning of urgency and safety communications


Procedures for DSC urgency and safety calls


Urgency communications


Safety communications


C3. Protection of distress frequencies


3.1 Avoiding harmful interference Avoidance of the transmission of false alerts Status of Channel 70


3.2 Transmissions during distress traffic


3.3 Prevention of unauthorised transmissions


3.4 Test protocols and procedures


Testing DSC equipment


Radiotelephone test procedures


3.5 Avoidance of transmissions in VHF guard bands


3.6 Procedures to follow when a false distress alert is transmitted 


C4. Maritime Safety Information (MSI) 


4.1 The NAVTEX system


purpose and capabilities, including distress and safety functions


C5. Alerting and Locating Signals 


5.1 Purpose and definition


5.2 Emergency Position Indicating Radio Beacons (EPIRBs)


Registration and coding


Operation, including automatic and manual activation


COSPAS/SARSAT 406 MHz EPIRB


Inmarsat-E 1.6 GHz EPIRB


VHF-DSC EPIRB


121.5 MHz homing function


Mounting considerations


Routine maintenance


Testing


Checking battery expiry date


 


Checking the float-free mechanism

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