THE MARITIME SAFETY COMMITTEE,
RECALLING Article 28(b) of the Convention on
the International Maritime Organization concerning the functions of the Committee,
RECALLING ALSO resolution A.886(21), by which
the Assembly resolved that the functions of adopting performance standards for radio and
navigational equipment, as well as amendments thereto, shall be performed by the
Maritime Safety Committee on behalf of the Organization,
NOTING the carriage requirement in SOLAS chapter IV/7.1.4 for a
receiver capable of receiving International NAVTEX narrow-band direct-printing (NBDP)
broadcasts for the promulgation of navigational and meteorological warnings to shipping,
NOTING FURTHER the success of the
International NAVTEX service in the promulgation of Maritime Safety Information (MSI),
NOTING ALSO with regard to the enhanced
storage, processing and display possibilities offered by recent technical advances,
CONSIDERING that further growth in information
promulgated to ships will be constrained by the capacity of the International NAVTEX
service and the increasing importance of National NAVTEX services,
HAVING CONSIDERED the recommendations on the revision of
resolution A.525(13) made by the Sub-Committee on Radiocommunications and Search and
Rescue at its seventh session,
1. ADOPTS the
revised Recommendation on Performance Standards for Narrow-Band Direct-Printing
Telegraph Equipment for the Reception of Navigational and Meteorological Warnings and
Urgent Information to Ships (NAVTEX), set out in the Annex to the present resolution;
2. RECOMMENDS Governments to ensure that
NAVTEX receiver equipment:
(a) if installed on or after 1 July
2005, conforms to performance standards not inferior to those specified in the Annex to
the present resolution;
(b) if installed before 1 July 2005,
conforms to performance standards not inferior to those specified in the Annex to
Annex Revised performance standards for narrow-band direct-printing telegraph equipment for the reception of NAVTEX
1.1 The equipment, in addition to meeting the
requirements of the Radio Regulations, the provisions of Recommendation ITU-R M.540
applicable to shipborne equipment and the general requirements set out in resolution
A.694(17), should comply with the following performance
The equipment should comprise radio receivers, a
signal processor and: either
- an integrated printing device; or
dedicated display device*, printer output port and a non-volatile message
- a connection to an integrated navigation system and a
non-volatile message memory.
* Where there is no printer, the dedicated display device should be located in
the position from which the ship is normally navigated.
3 Controls and indicators
3.1 Details of the coverage areas and message
categories which have been excluded by the operator from reception and/or display
should be readily available.
4.1 The equipment should contain one receiver operating
on the frequency prescribed by the Radio Regulations for the International NAVTEX
System. The equipment should contain a second receiver capable of working at the
same time as the first one on at least two other frequencies recognised for the
transmission of NAVTEX information. The first receiver should have priority in the
display or printing of received information. Printing or displaying of messages from
one receiver should not prevent reception by the other receiver.
4.2 The receiver sensitivity should be such that for a
source with an e.m.f. of 2µV in series with a non-reactive impedance of 50 Ohm, the
character error rate is below 4%.
5 Display device and printer
The display device and/or printer should be able to
display a minimum of 32 characters per line. 5.2
If a dedicated display device is used, the following requirements
should be met:
- an indication of newly received unsuppressed messages should
be immediately displayed until acknowledged or until 24 hours after receipt; and
- newly received unsuppressed messages should also be displayed.
The display device should be able to display at least
16 lines of message text. 5.4
and size of the display device should be such that displayed information is easily
read under all conditions by observers at normal working distances and viewing
If automatic line feed
entails division of a word, this should be indicated in the displayed/printed text.
When displaying received messages
on a display device, a clear indication of the end of a message should be given by
automatically adding line feeds after the message or including some other form of
delineation. The printer or printer output should automatically insert line feeds
after completing print of the received message. 5.7
The equipment should display/print an asterisk if the character is
received corrupted. 5.8
Where the printer
is not integrated, it should be possible to select the following data to be output
to a printer:
- all messages as they are received;
- all messages
stored in the message memory;
- all messages received on specified
frequencies, from specified locations or having specified message designators;
- all messages currently displayed; and
- individual messages
selected from those appearing on the display.
6.1 Non-volatile message memory
6.1.1 For each receiver fitted it should
be possible to record at least 200 messages of average length 500 characters
(printable and non-printable) in non-volatile message memory. It should not be
possible for the user to erase messages from memory. When the memory is full, the
oldest messages should be overwritten by new messages.
6.1.2 The user should be able to tag individual messages for
permanent retention. These messages may occupy up to 25% of the available memory and
should not be overwritten by new messages. When no longer required, the user should
be able to remove the tag on these messages which may then be overwritten in normal
6.2 Message identifications
6.2.1 The equipment should be capable of
internally storing at least 200 message identifications for each receiver provided.
6.2.2 After between 60 h and 72 h, a
message identification should automatically be erased from the store. If the number
of received message identifications exceeds the capacity of the store, the oldest
message identification should be erased.
6.2.3 Only message identifications which have been satisfactorily
received should be stored; a message is satisfactorily received if the error rate is
6.3 Programmable control
6.3.1 Information for location (B1)* and
message (B2)* designators in programmable memories should not be erased by
interruptions in the power supply of less than 6 h.
* Refer Recommendation ITU-R M.540-2.
7.1 The receipt of search and rescue information (B2 =
D) should give an alarm at the position from which the ship is normally navigated.
It should only be possible to reset this alarm manually.
8 Test facilities
8.1 The equipment should be provided with a facility to
test that the radio receiver, the display device/printer and non-volatile message
memory are functioning correctly.
9.1 The equipment should include at least one interface
for the transfer of received data to other navigation or communication equipment.
9.2 All interfaces provided for
communication with other navigation or communication equipment should comply with
the relevant international standards.*
9.3 If there is no integrated printer, the equipment should include a
standard printer interface.
* Refer to IEC 61162.