A.DSC B.EPIRB C.EGC D.NBDP
A.Inmarsat SES B.VHF /DSC or MF/DSC C.SART and VHF/DSC D.Satellite EPIRB and VHF /DSC
A.ship in distress and assisting units B.NCS and RCC C.RCCs and “on-scene commander” or “coordinator surface search” D.ship in distress and coast station