16(j) of the Convention on the International Maritime Organization concerning the
functions of the Assembly in relation to regulations concerning maritime safety,
NOTING resolution A.420(XI) on the development of the
maritime distress and safety system which recommends that Administrations should introduce
narrow-band direct printing broadcasts for the purpose of promulgation of navigational and
meteorological warnings to shipping,
that Baltic and North Sea States within NAVAREA I have, after a period of successful
trials, established a pre-operational narrow-band direct printing service (called NAVTEX)
of broadcasts for the North Sea and Baltic Sea areas,
CONSIDERING that narrow-band direct printing broadcasts are an element of the future
global maritime distress and safety system,
CONSIDERING FURTHER that similar services may be expected to be established in other
areas of the world and that shipborne equipment should be standardized to ensure efficient
operation of such services,
HAVING CONSIDERED the
recommendation made by the Maritime Safely Committee at its forty-eighth session,
1. ADOPTS the Performance Standards for Narrow-Band
Printing Telegraph Equipment for the Reception of Navigational and Meteorological Warnings
and Urgent Information to Ships set out in the Annex to the present resolution;
2. RECOMMENDS Administrations to ensure that equipment
for the reception of narrow-band direct printing broadcasts of navigational and
meteorological warnings and urgent information to ships conforms to performance standards
not inferior to those specified in the Annex to the present resolution.
Annex Performance standards for narrow-band direct printing telegraph equipment for the reception of navigational and meteorological warnings and urgent information to ships
1 The equipment should conform with the provisions of CCIR
Recommendation 540 applicable to shipborne equipment and in addition with the provisions
given in the following paragraphs.
equipment should comprise a radio receiver, a signal processor and a printing device.
3 Details of the coverage areas and message
categories which have been excluded by the operator from reception should be readily
4 The receiver should operate on
the frequency prescribed by the Radio Regulations for the system.
5 The equipment should be provided with a facility to test that
the radio receiver, signal processor and printing device are functioning correctly.
6 The equipment should be capable of internally
storing at least 30 message identifications. After between 60 and 72 hours 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.
message identifications which have been satisfactorily received should be stored; a
message is satisfactorily received if the character error rate is below 4 %.
8 The receipt of search and rescue information
should give an alarm at the position from which the ship is normally navigated. It
should be possible only to reset this alarm manually.
9 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 hours.
11 The printing device should
be able to print at least 32 characters per line.
12 If automatic line feed entails division of a word, this shall be indicated
in the written text. The printing device should automatically feed paper after
completing the printed message.
equipment should print an asterisk if a character is received mutilated.
* See CCIR Recommendation 540. 10 The receiver sensitivity should be such that for a
source with an e.m f. of 2ìV in series with a non-reactive impedance of 50 ohms, the
character error rate is below 4%.