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

This is}ustina,}ustina,}ustina - GJUS - MMSI 232456789.

Please cancel Navigation Warning 25/1200UTC - vessel now

under way. Thames Coastguard please acknowledge - Over

}ustina this is Thames Coastguard - Received - Out.

}ustina's Radio Log would look like:

Date/time Station Station

UTC To From

25.12.()1

1200 All Stations justina

1201/ All Stations justinalGJUS

1

1

102

1202 justina

1230 All Stations

1230/31 "

1300 All Stations

1300/01

1319 All Stations

1320121

1321 justina

1322

Thames C/G

justina

justina

justina

justina

justina

justinalGJUS

Thames C/G

Remarks

Frequency

Channel or

Satellite

DSC Safety Alert j Uhuru Ch70

Nav Wng 25/1200UTC - 51 30N 001 23E Ch16

Lost main engine power - unable to manoeuvre

Expected duration 3 hrs - no assistance req'd

Vessels in the area please keep a wide berth +

(R - listening out Ch 16 if required) Ch I (j

DSC Safety Alert Ch70

(Nav Warning 2511200UTC repeated) Chlli

DSC Safety Alert Ch70

(Nav Wng 25/1200UTC repeated) Chlti

DSC Safety Alert Ch70

(Nav Wng 2S11200UTC cancelled) Chl6

(Received) Ch 16

(Resumed normal radio watch) j Uhuru

Author's explanation:

Following the initial broadcast,justina should repeat the broadcast at 30 minute

intervals - to warn any vessels which may have moved into the area. Once the

problem has been corrected, a 'cancellation' message is sent - using the original

'date/time'reference. As Thames Coastguard acknowledged the original

transmission,}ustina should ensure that Thames CG receives the cancellation

message. Full GMDSS regulations allow for the watchkeeper to 'sign-off' Channel

76 watch when the situation has been resolved. An amendment to the original

GMDSS rules, however, means that watch on Ch 76 must be maintained, when at

sea and whenever practicable, until 7 Feb 2005 (after which the entry timed 7322,

above, will read 'Off Watch 'for Channel 76)

Example - Vessel]ustina/GjVS, being of deep draft and

restricted movement, wants to ask an unknown vessel,

observed by radar, to allow justina to move out of restricted

waters (On Ch13 - the Intership Safety of Navigation

Channel)

'Vessel two miles East of Dunderhead Buoy, steering 270 degrees - This is

justina,justina,justina - GolfJuliet Uniform Sierra - Over'

'GJUS this is GWIZ -two miles East of Dunderhead Buoy and approaching - Over'

124 THE NAUTICAL INSTITUTE