'Silence Mayday' and 'Silence Distress' are used during distress
working to silence an interfering station. 'Silence Mayday' is used by the
casualty, or other station controlling distress. 'Silence Distress' can be
used by a station - other than the controlling station - to silence an
interfering station (note 'station' refers to the 'radio station' onboard ships
and aircraft, not just to coast stations). 'Silence Fini' is used by the
controlling station to indicate that distress working has ended and that
normal working may resume. 'Prudonce' may be used by the controlling
station to allow 'restricted working' on a frequency where distress traffic
has gone quiet (e.g. when most distress working is on Ch 16, the controlling
station may allow 'restricted working' on 2182kHz).
Examples (All on Ch16/2182kHz except for 'Prudonce' example)
'Mayday - MY Pralt this is CROSS MED - Silence Mayday
(,CROSS MED' - French MRCC La Garde) telling Motor Yacht 'halt'to
keel!..!Juie~ they a"!...!:nterf!!i.!!l with distress .!!!.orki!!p' _ _____ _
'Mayday - MV Pratto this is Wizard - Seelonce Distress
{Wizard telling MV Prallo to keep quiet - they are interfering with distress
~~i~ ____________________ _
'Mayday All Stations, All Stations, All Stations - this is Thames
Coastguard, Thames Coastguard, Thames Coastguard Time
1230UTC -justinalGJUS - all persons evacuated - Seelonce Fini'
(Thames Coastguard telling 'All Stations' that distress working for justina
has .!...nded.!!:.n!Lthat ~".!!!:aJ.... workinfU!1.~ be resu!!!!d). ______ _
(on 2182kHz only)
'Mayday All Stations this is Thames Coastguard - Time 1200UTC -
JustinalGJUS - Seelonce Ch16, Prudonce 2182kHz '
(Thames Coast Guard telling 'All Stations' that distress workingfor justina
is still in progress on Ch 16, but that 'restricted working' is being allowed on
2182kHz. ~ssell" should keep calli" on 2782kHz brief and should move quickly
to a working channel - and they should realise that silence may be re-imposed
at any time).MARINE COMMUNICATIONS 109