Article 15(j) of the Convention on the International Maritime Organization concerning
the function of the Assembly in relation to regulations and guidelines concerning
RECOGNIZING the need to prepare
performance standards for enhanced group call equipment in order to ensure the
operational reliability of such equipment and to avoid, as far as practicable, adverse
interaction between such equipment and other communication and navigation equipment
aboard the ship,
HAVING CONSIDERED the
recommendation made by the Maritime Safety Committee at its fifty-fifth session,
1. ADOPTS the Recommendation on Performance Standards
for Enhanced Group Call Equipment, the text of which is set out in the Annex to the
2. NOTES that part A of the
INMARSAT design and installation guidelines for enhanced group call equipment is similar
to the present performance standards for enhanced group call equipment and to the
performance standards for shipborne radio equipment - general requirements (resolution
3. RECOMMENDS Member Governments to
ensure that every enhanced group call equipment which will form part of the global
maritime distress and safety system conforms to performance standards not inferior to
those specified in the Annex to this resolution, which are in accordance with part A of
the INMARSAT design and installation guidelines for enhanced group call equipment;
4. INVITES INMARSAT to ensure that any amendments to
part A of the INMARSAT design and installation guidelines for enhanced group call
equipment be agreed with the Organization prior to their implementation;
5. REQUESTS the Maritime Safety Committee to ensure
that any proposed amendments to this resolution be agreed with INMARSAT prior to their
consideration by the Assembly.
Annex Recommendation on performance standards for enhanced group call equipment
1.1 The enhanced group call equipment to be used in the
INMARSAT system should comply with the general requirements set out in Assembly
resolution A.569(14) and the following minimum performance requirements.
1.2 The equipment should be capable of
producing a printed copy of received information. Received EGC messages may be
stored, with indication that the message has been received, for later printing,
except for the vital messages referred to in paragraphs 3.2 and 3.5, which should be
printed out upon receipt.
enhanced group call installation may be either separate or combined with other
* Elements of other installations, e.g. the antenna, low noise amplifier and
down-converter of the ship earth station, may be shared for the reception of
enhanced group call messages.
2 Technical requirements
The equipment should be type-approved by INMARSAT and should
comply with the environmental conditions specified in the INMARSAT technical
requirements for the enhanced group call receiver.
3.1 Means should be provided to enter the ship's
position and area code manually so that area group calls can be received.
Optionally, the ship's position, as determined by the navigational equipment, may be
entered automatically and the area code automatically derived therefrom.
3.2 Provision should be made for a specific
aural alarm and visual indication at the position from which the ship is normally
navigated to indicate receipt of a distress or urgency call or a call having
distress category. It should not be possible to disable this alarm and it should
only be possible to reset it manually.
3.3 The equipment should indicate when it is not correctly tuned or
synchronized to the enhanced group call carrier.
3.4 Any message should be printed regardless of the character error rate
of its reception. The equipment should print a low line mark if a character is
3.5 Acceptance or
rejection of service codes* should be under the operator's control except that
equipment should be unable to reject relevant navigational warnings, meteorological
warnings, search and rescue information and certain special warnings, which are
directed to a geographical area within which the ship is operating.
3.6 Means should be provided not to reprint the same
message after it has been received without error.
3.7 The printing device should be capable of printing at least the
Standard IA Number 5 character set. Other character sets are optionally used
according to ISO 2022 or CCITT Recommendation T.61.
3.8 The printing device should be able to print at least 40
characters per line.
3.9 The signal
processor and printing device should ensure that if a word cannot be accommodated in
full on one line, it should be transferred to the next line. The printing device
should automatically feed five lines after completing the printed messages.
* The meaning of the service codes is the same as for the NAVTEX system (see CCIR
Recommendation 540 and the NAVTEX Manual).
4 Power supply
4.1 The enhanced group call equipment should normally
be powered from the ship's main source of electrical energy. In addition, it should
be possible to operate the enhanced group call equipment, and all other equipment
necessary for its normal functioning, from an alternative source of energy.
4.2 Changing from one source of supply to
another, or any interruption of up to 60 s duration of the supply of electrical
energy, should not require the equipment to be manually re-initialized and should
not result in loss of received messages stored in the memory.
5 Antenna sitting
5.1 Where an omnidirectional antenna is used, it is
desirable that the antenna be sited in such a position that no obstacle likely to
degrade significantly the performance of the equipment appears in the fore and aft
directions down to -5° and in the port and starboard directions down to -15°.
5.2 Where a stabilized directive antenna is
used, it is desirable that the antenna be sited in such a position that no obstacle
likely to degrade significantly the performance of the equipment appears in any
azimuth down to -5°.
omnidirectional antennas, objects, especially those within 1 m of the antenna which
cause a shadow sector of greater than 2°, are likely to degrade significantly the
performance of the equipment.
directive antennas, objects, especially those within 10 m of the antenna which cause
a shadow sector of greater than 6°, are likely to degrade significantly the
performance of the equipment.