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

Problem: I would like to experiment with my Inmarsat-C software, to familiarise myself with the Distress Alert/Message system - ...

(v) If someone onboard your vessel still manages to send a false 'Distress Alert' or false 'Distress Priority Message' using you ...

Author's explanation: With telex messages, there is no need for the 'eaU'. The symbol +? is universally used in radio telex comm ...

DSC Distress Alert received on 2187.5kHz, direct from the vessel in Distress {i.e., not a 'relay/acknowledgement' from another v ...

~ » lJ z m () o ~ ~ c z () ~ o z CJ) CD W Log Example 1: Distress Alert received on 2187.5kHz (by ground wave propagation - - ca ...

co """ -I I m z » c -I () » r Z CJ) -I -I C -I m Log example 2: Distress Alert received on 2187.5kHz (by sky wave propagation - ...

~ :t> :D Z m () o ~ ~ c z () :t> -I o Z (J) CD (J1 Log Example 3: Distress Alert received on 2187.5kHz (by sky-wave propag ...

CD en -l I m z ::t:- C -l () ::t:-o Z ~ =i c -l m Log Example 4: Distress Alert received by HF DSC: Date/time UTC 27.10.01 0400 ...

Problem 1: Wrongful DSC Distress Acknowledgement When a DSC Distress Alert is received onboard another vessel, alarms sound - on ...

Situation (i) was covered earlier, where the' Wizard' received a DSC Distress Alert which was not acknowledged by a Coast Statio ...

DSC Distress Relay I voice Mayday Relay Flowchart VHF I MF procedures DSC Distress Alert No Heard or seen another vesscllaircnlf ...

Voice 'Mayday Relay' procedures Example 1 - voice Mayday Relay call/message on Ch 16121B2kHz, following a DSC 'All Stations' Dis ...

You are using VHF or MF procedures (not HF - see below). If you need to send a DSC Distress Relay to a Coast Station/ MRCC: Est ...

Action on Receiving a DSC Distress Relay/DSC Distress Acknowledgement DSC Dislress Relay / Distress Acknowle~emelll received fro ...

~ » JJ z m () o ~ ~ c z () ~ o z CJ) ...... o c.u Log Example I: DSC Distress Relay received from MRCC - casualty in reasonable ...

-" ~ -I I m z » c -I () » r Z Cl) -I -I C -I m Log Example2: DSC Distress Acknowledgement received from another vessel - casualt ...

Question: I rarely receive a DSC Distress Alert directly from the vessel in distress - but I receive lots of DSC 'Distress Relay ...

False alert sent on Ch70 (subsequent communications always voice, on Chlfi). False alert sent on 2187.5kHz (indicatingJ3E - mean ...

False alert sent on 2187.5kHz indicatingJ3E (voice) for subsequent communications - DSC Distress Ack' received from station 0023 ...

False alert sent on 8414.5kHz indicating Telex for subsequent communications - Example - No DSC Acknowledgement received from an ...