A.double frequencies B.single frequency C.dedicated frequency D.multiple frequencies
A.Inmarsat SES B.VHF/DSC or MF/DSC C.SART and VHF/DSC D.Satellite EPIRB and VHF/DSC
A.indicate the ship in distress that the alert has been received B.alert ships in the area of a distress incident that a distress has occurred C.inform other coast station of distress incident D.repeat the distress alert in 5 minutes