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

False alert sent on Ch70 (subsequent communications always voice,

on Chlfi).

False alert sent on 2187.5kHz (indicatingJ3E - meaning subsequent

communications by voice on 2182kHz; or indicating Telex - meaning

subsequent telex communications on 2174.5kHz).

• False alert sent on one of the HF frequencies (e.g. alert sent on
  8414.SkHz) - indicating J3E (voice) - or Telex - for subsequent
  communications).
  The following examples explain how to act after sending a false
  DSC Alert. Vessel isJustina, callsign GJUS, MMSI 232456789.

False alert sent on VHF Ch70 - no Coast Station/MRCC

Acknowledgement:

• RESET your DSC Controller (to stop it repeating the Distress Alert)


• Switch to Ch16 (where everyone who received your false Distress
  Alert will be listening for your Distress Call/Message:


• Call:
  'Mayday All Stations, All Stations, All Stations
  this is Justina,Justina, Justina - callsign GJUS - MM SI 232456789
  Cancel my false Distress Alert sent on Ch70 at 2510520UTC - Out'


• Enter details in your radio log (example below);


• Inform the Master:

Date/time Station

UTC To

27.10.01

0520

0521 All Stations

0526

0526

Station

From

232456789

Justina

Remarks

Frequency

Channel or

Satellite

(Distress Alert sent in error)] Uhuru Ch70

Cancel false Distress Alert 2510520UTC Chl6

(no verbal responses) (Master informed) Ch 16

(off watch) J UhUTU

Author's explanation:

As your false alert was transmitted on Ch 70, any receiving vessel/Coast Station

would be listening on Ch 76 - and that is where you must send your cancellation

message. Having sent your cancellation message, wait on Ch 76 for a few minutes

to receive any late responses from stations that may not have received your voice

message. If nothing heard after 5 minutes of the alertlcancellation message being

transmitted, you can cease Ch 76 watch. Make sure that your DSC Controller does

not automatically repeat the Distress Alert, by resetting the equipment immediately

after the first false alert is transmitted.

106 THE NAUTICAL INSTITUTE