Ian Waugh - A Mariner\'s Guide to Marine Communications

DSC Distress Relay I voice Mayday Relay Flowchart

VHF I MF procedures

DSC Distress Alert No Heard or seen another vesscllaircnlft

Received on Ch70, or apparently in distress?

:.!187.5kHz?

Yes Yes

Follow procedure on Set watch Chl6 VHF (ifin Sea Area AI) or
page 78 (Ch70) Ch 16 VHF and 2182.5kHz
or page 83 (2187.5kHz) (Sea Areas A21 A3/ A4)

Coast Station / MRCC

or other Distress lTaffic heard?

Yes No

Own vessel able to assist? Own vessel made contact

Note - this is a decision fr

the master of the vesSi

with the casualty?

No Yes Yes No

Acknowled~e by voice Send individual

on Ch 16/2 82kHz, e.g: DSC Distress Relay Alert

Mayday Justina (x3) this is Wi<:ard (x3) and voice Ma(;d,,)( Relay message

ReceIved Mayday (position/ETA) to the M R C Coast Station

responsible for the area

(see note I)

or rel':h details ashore

by any 0 er suitable means

(e.g. Satcom)

Eoter details

in Radio Log and

~roceed on voyage Further assistance required

IAMSAR Manual but casualty unable to request

refers) that assistance?

No Yes

Send DSC All Stations Distress Relay Alert

on Ch 70 (Area A I) or 2187.5kHz (Areas A2/ A3/ A4)

followed 'd voice Matday Relay Call/Message on

hl6 I 2H!2 Hz as 'ifCropriate

and relay details to the M C responsible

for the area by any other suitable means

(see note 2)

Follow directions from casualty, controlling MRCC / Coast Station

or On-Scene Co-ordinator (OSC)

(IAMSAR Manual refers)

MARINE COMMUNICATIONS 99