Global maritime distress and safety system (GMDSS) - Part 6: Narrowband direct-printing telegraph equipment for the reception of navigational and meteorological warnings and urgent information to ships (NAVTEX)

IEC 61097-6:2005+A1:2011(E) Specifies the minimum performance requirements, technical characteristics and type-testing requirements for narrowband telegraph equipment for the reception of navigational and meteorological information as required by the International Convention for Safety of Life at Sea (SOLAS), and which is associated with IEC 60945. Also incorporates the performance standards of the relevant IMO resolutions and conforms with the ITU-R regulations where applicable. This consolidated version consists of the second edition (2005) and its amendment 1 (2011). Therefore, no need to order amendment in addition to this publication.

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Status
Published
Publication Date
29-Jan-2012
Current Stage
PPUB - Publication issued
Start Date
30-Jan-2012
Completion Date
30-Jan-2012
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IEC 61097-6:2005+AMD1:2011 CSV - Global maritime distress and safety system (GMDSS) - Part 6: Narrowband direct-printing telegraph equipment for the reception of navigational and meteorological warnings and urgent information to ships (NAVTEX)
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IEC 61097-6
®

Edition 2.1 2012-01
INTERNATIONAL
STANDARD

colour
inside


Global maritime distress and safety system (GMDSS) –
Part 6: Narrowband direct-printing telegraph equipment for the reception of
navigational and meteorological warnings and urgent information to ships
(NAVTEX)

IEC 61097-6:2005+A1:2011(E)

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IEC 61097-6

®


Edition 2.1 2012-01




INTERNATIONAL



STANDARD








colour

inside










Global maritime distress and safety system (GMDSS) –

Part 6: Narrowband direct-printing telegraph equipment for the reception of

navigational and meteorological warnings and urgent information to ships


(NAVTEX)
























INTERNATIONAL

ELECTROTECHNICAL

COMMISSION

PRICE CODE
CN


ICS 47.020.70 ISBN 978-2-88912-905-8



  Warning! Make sure that you obtained this publication from an authorized distributor.


® Registered trademark of the International Electrotechnical Commission

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– 2 – 61097-6  IEC:2005+A1:2011(E)
CONTENTS
FOREWORD . 4
INTRODUCTION . 6
INTRODUCTION (to Amendment 1) . 6

1 Scope . 7
2 Normative references . 7
3 Definitions and abbreviations . 8
3.1 Definitions . 8
3.2 Abbreviations . 8
4 Performance requirements . 9
4.1 General . 9
4.2 General characteristics . 9
4.3 Specific characteristics . 10
4.4 Interfaces . 12
4.5 Receiver . 13
4.6 Display . 13
4.7 Integral printer . 15
4.8 NAVTEX message memory . 15
4.9 Power supplies . 16
4.10 Source of UTC . 16
5 Test conditions . 17
5.1 General . 17
5.2 Performance test . 18
5.3 Performance check. 18
5.4 Normal and extreme conditions . 18
5.5 Standard test signal . 19
5.6 Standard test file . 20
5.7 Arrangement for test signal applied to the receiver input . 20
5.8 Artificial antennas . 20
5.9 Measurement uncertainty . 20
5.10 Interpretations of measurement results . 21
5.11 Conducted and radiated RF immunity tests exclusion bands . 21
5.12 Narrow band responses on receivers . 21
6 Environmental tests required . 21
7 Serial interface tests . 22
7.1 INS input electrical tests . 22
7.2 INS input performance tests . 22
7.3 INS output electrical tests. 22
7.4 INS output performance tests . 22
7.5 Printer output electrical tests . 22
7.6 Printer output performance tests . 23
8 General and signal processing tests . 23
8.1 Exclusion of stations . 23
8.2 Exclusion of message categories. 23

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61097-6  IEC:2005+A1:2011(E) – 3 –
8.3 Receiver test facility . 24
8.4 Search and rescue (SAR) alarm provision and reset . 24
8.5 Additional alarms . 24
9 Receiver tests . 24
9.1 Call sensitivity . 25
9.2 Interference rejection and blocking immunity . 25
9.3 Co-channel rejection . 26
9.4 Intermodulation . 26
9.5 Off-frequency transmitter . 27
9.6 Simultaneous operation on several receive frequencies. 27
9.7 Protection of input circuits . 27
10 Printer tests . 28
10.1 Basic requirements . 28
10.2 Paper roll end alarm and storage inhibition . 28
10.3 Automatic line feed indication and paper feed . 28
10.4 Mutilated character indication . 29
10.5 Tests of technical characteristics (ITU-R Recommendation M.540) . 29
11 Memory tests . 30
11.1 Internal storage, message tagging and erasure of oldest message
identifications . 30
11.2 Erasure of message identifications/storage time . 31
11.3 Storage of message identifications . 32
11.4 Reception of messages with character errors . 32
11.5 Unsatisfactory reception . 33
11.6 Power-off check . 33
11.7 Brown-out test . 34
11.8 UTC handling check . 34
12 Miscellaneous tests . 35
12.1 Spurious emissions . 35
12.2 Equipment manuals – checks of the manufacturer's documentation . 35
12.3 Marking and identification . 35

Annex A (informative) Block diagrams of NAVTEX systems . 36
Annex B (normative) Definition of satisfactory reception of a message . 38
Annex C (informative) IEC 61162 sentences for NAVTEX operation . 39
Annex D (normative) Manufacturer’s declarations/equipment manual . 42

Figure A.1 – EUT with an integral printing device . 36
Figure A.2 – EUT with an integral display device . 36
Figure A.3 – EUT black box receiver . 37

Table 1 – Alarm conditions signaled using the ALR sentence formatter . 12
Table 2 – Extreme power supply variation . 18
Table 3 – Unwanted signal levels . 25
Table 4 – Intermodulation frequency pairs . 26

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– 4 – 61097-6  IEC:2005+A1:2011(E)
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________

GLOBAL MARITIME DISTRESS AND
SAFETY SYSTEM (GMDSS) –

Part 6: Narrowband direct-printing telegraph equipment
for the reception of navigational and meteorological warnings
and urgent information to ships (NAVTEX)



FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
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8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of patent
rights. IEC shall not be held responsible for identifying any or all such patent rights.

This consolidated version of IEC 61097-6 consists of the second edition (2005)
[documents 80/419/FDIS and 80/424/RVD] and its amendment 1 (2011) [documents
80/619/CDV and 80/648/RVC]. It bears the edition number 2.1.
The technical content is therefore identical to the base edition and its amendment and
has been prepared for user convenience. A vertical line in the margin shows where the
base publication has been modified by amendment 1. Additions and deletions are
displayed in red, with deletions being struck through.

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61097-6  IEC:2005+A1:2011(E) – 5 –
International Standard IEC 61097-6 has been prepared by IEC technical committee 80: Maritime
navigation and radiocommunication equipment and systems.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
IEC 61097 consists of the following parts under the general title Global maritime distress and
safety system (GMDSS):
Part 1: Radar transponder – Marine search and rescue (SART) – Operational and
performance requirements, methods of testing and required test results
Part 2: COSPAS-SARSAT EPIRB – Satellite emergency position indicating radio beacon
operating on 406 MHz – Operational and performance requirements, methods of
testing and required test results
Part 3: Digital selective calling (DSC) equipment – Operational and performance
requirements, methods of testing and required testing results
Part 4: INMARSAT-C ship earth station and INMARSAT enhanced group call (EGC)
equipment – Operational and performance requirements, methods of testing and
required test results
Part 5: Inmarsat-E – Emergency position indicating radio beacon (EPIRB) operating
through the Inmarsat system – Operational and performance requirements, methods
of testing and required test results
Part 6: Narrowband direct-printing telegraph equipment for the reception of navigational
and meteorological warnings and urgent information to ships (NAVTEX)
Part 7: Shipborne VHF radiotelephone transmitter and receiver – Operational and
performance requirements, methods of testing and required test results
Part 8: Shipborne watchkeeping receivers for the reception of digital selective calling (DSC)
in the maritime MF, MF/HF and VHF bands – Operational and performance
requirements, methods of testing and required test results
Part 9: Shipborne transmitters and receivers for use in the MF and HF bands suitable for
telephony, digital selective calling (DSC) and narrow band direct printing (NBDP) –
Operational and performance requirements, methods of testing and required test
results
Part 10: Inmarsat-B ship earth station equipment – Operational and performance
requirements, methods of testing and required test results
Part 12: Survival craft portable two-way VHF radiotelephone apparatus – Operational and
performance requirements, methods of testing and required test results
Part 13: Inmarsat F77 ship earth station equipment – Operational and performance
requirements, methods of testing and required test results
The committee has decided that the contents of the base publication and its amendments will
remain unchanged until the stability date indicated on the IEC web site under
"http://webstore.iec.ch" in the data related to the specific publication. At this date, the
publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
A bilingual version of this standard may be issued at a later date.

IMPORTANT – The “colour inside” logo on the cover page of this publication indicates
that it contains colours which are considered to be useful for the correct understanding
of its contents. Users should therefore print this publication using a colour printer.

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– 6 – 61097-6  IEC:2005+A1:2011(E)
INTRODUCTION
NAVTEX provides shipping with navigational and meteorological warnings and urgent
information by automatic display and/or print out from a dedicated receiver.
NAVTEX is a component of the IMO/IHO World-Wide Navigational Warning Service (WWNWS)
defined by IMO Assembly Resolution A.706(17), as amended, and the WMO Manual on Marine
Meteorological Services, Part Ibis, Provision of warnings and weather and sea bulletins
(GMDSS application). It has been included as an element of the Global Maritime Distress and
Safety System (GMDSS).
The original NAVTEX specification allowed for equipment with integral printers and precluded
the fitting of equipment which relied on other ways of recording and displaying NAVTEX data.
The use of Liquid Crystal Displays and other Visual Display Units is now ubiquitous on ships’
bridges and this revision of the specification allows for their use in displaying NAVTEX data.
As a result of the final cessation of the distresss watch on 500 kHz in 1999 the frequency
490 kHz became available for use as a national NAVTEX channel and this has now been widely
implemented around the world. This NAVTEX specification therefore requires simultaneous
operation on an additional channel to the international channel of 518 kHz.
IMO Resolution MSC.148(77) states that the equipment should comprise radio receivers, a
signal processor and:
a) an integrated printing device; or
b) a dedicated display device, printer output port and a non-volatile message memory; or
c) a connection to an integrated navigation system and a non-volatile message memory.


INTRODUCTION
(to Amendment 1)
The amendment removes the description in Annex C of the sentences NRX and NRM. These
sentences are now described in IEC 61162-1 (see NOTE below).
NOTE Applies as of edition 4 (2010).

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61097-6  IEC:2005+A1:2011(E) – 7 –
GLOBAL MARITIME DISTRESS AND
SAFETY SYSTEM (GMDSS) –

Part 6: Narrowband direct-printing telegraph equipment
for the reception of navigational and meteorological warnings
and urgent information to ships (NAVTEX)


1 Scope
This part of IEC 61097 specifies the minimum performance requirements, technical character-
istics and type-testing requirements for narrowband telegraph equipment for the reception of
navigational and meteorological information as required by Regulation IV/7.1.4 of the 1988
amendments to the 1974 International Convention for Safety of Life at Sea (SOLAS), and which
is associated with IEC 60945. When a requirement in this standard is different from IEC 60945,
the requirement in this standard takes precedence.
This standard incorporates the performance standards of IMO Resolution MSC.148(77), the
technical characteristics of ITU-R Recommendation M.540, takes account of the IMO Resolution
A.694(17) and conforms with the ITU Radio Regulations where applicable.
All text of this standard, whose meaning is identical to that in IMO Resolution MSC.148(77) and
ITU-R Recommendation M.540 will be printed in italics and the Resolution/Recommendation
and paragraph number indicated between brackets.
2 Normative references
The following referenced documents are indispensable for the application of this document. For
dated references, only the edition cited applies. For undated references, the latest edition of the
referenced document (including any amendments) applies.
IEC 60945, Marine navigation and radio communication equipment – General requirements –
Methods of testing and required test results
IEC 61162-1, Maritime navigation and radiocommunication equipment and systems – Digital
interfaces – Part 1: Single talker and multiple listeners
IEC 61162-2; Maritime navigation and radiocommunication equipment and systems – Digital
interfaces – Part 2: Single talker and multiple listeners, high-speed transmission
IMO Safety of Life at Sea (SOLAS) Convention (1974), as amended (GMDSS)
IMO Resolution A.694(17) (1991) General requirements for shipborne radio equipment forming
part of the global maritime distress and safety system (GMDSS) and for electronic navigational
aids
IMO Resolution MSC.148(77) (2003) Revised performance standards for narrow-band
direct-printing telegraph equipment for the reception of navigational and meteorological
warnings and urgent information to ships (NAVTEX)
IMO Publication – NAVTEX Manual
IMO Resolution MSC/Circ.1122 Adoption of the revised NAVTEX manual

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– 8 – 61097-6  IEC:2005+A1:2011(E)
ITU-R Recommendation M.540-2:1990, Operational and technical characteristics for an
automated direct printing telegraph system for promulgation of navigational and meteorological
warnings and urgent information to ships
ITU-R Recommendation M.625-3:1995, Direct-printing telegraph equipment employing
automatic identification in the maritime mobile service
3 Definitions and abbreviations
For the purposes of this document, the following definitions and abbreviations apply.
3.1 Definitions
3.1.1
LORAN-C
long range radio-navigation system operating on an assigned frequency of 100 kHz
3.1.2
NAVTEX
system for the broadcast and automatic reception of maritime safety information by means of
narrow-band telegraphy
3.1.3
Test script
text file containing a number of NAVTEX messages formatted as defined in 5.5. The STF is a
particular example of a test script
3.2 Abbreviations
ASCII  American Standard Code for Information Interchange
CER  character error rate
EMC  electromagnetic compatibility
EUT  equipment under test
HMI  human-machine interface
INS integrated navigation system
IMO  International Maritime Organization
ITU  International Telecommunication Union
PC  performance check
PT  performance test
RTC  real time clock
SAR  search and rescue
STF  standard test file
STS  standard test signal
USB  Universal Serial Bus
UTC  Co-ordinated Universal Time

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61097-6  IEC:2005+A1:2011(E) – 9 –
4 Performance requirements
4.1 General
(148/A.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), and specified in IEC 60945 shall comply
with the revised IMO performance standards for NAVTEX equipment Resolution MSC 148(77).
(148/A.2.1) The equipment shall comprise radio receivers, a signal processor and: either
a) an integrated printing device; or
b) a dedicated display device, printer output port and a non-volatile message memory; or
NOTE Where there is no printer, the dedicated display device shall be able to be located in the position from which
the ship is normally navigated.
c) a connection to an integrated navigation system (INS) and a non-volatile message memory.
Examples of NAVTEX systems are given in Annex A.
4.2 General characteristics
(540/AII.2) The equipment shall be capable of receiving messages in the collective B-mode of
the direct printing system specified in ITU-R Recommendation M.625, Annex I,4.
(540/AII.3) The technical format of the transmission shall be in accordance with ITU-R
Recommendation M.540, Annex II,3 as follows:

Carriage

Carriage
return

Phasing One
return
+
ZCZC B B B B Message NNNN
1 2 3 4
signal space
+
2 line
≥10 s
line feed
feeds

End of

Carriage
emissions

Phasing One Carriage
return +
idle signal
Message NNNN
ZCZC B’ B’ B’ B’
1 2 3 4
signal space return &
2 line
⋅α ⋅α . α
line feed
feeds
≥5 s
≥2 s

where
ZCZC defines the end of the phasing period
B character is a letter (A-Z) identifying the transmitter coverage area.
1
B character is a letter (A-Z) for each type of message as follows:
2
A navigational warning
B meteorological warning
C ice report
D search and rescue information/piracy and armed robbery
E meteorological forecast

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– 10 – 61097-6  IEC:2005+A1:2011(E)
F pilot message
G AIS
H LORAN-C message
I reserved presently not used
J SATNAV message
K other electronic navigational aid system message
L navigational warning (additional)
M to Y reserved presently not used
Z QRU (no message on hand)
B B characters are the serial number of the message between 01 and 99.
3 4

4.3 Specific characteristics
4.3.1 B and B characters
1 2
(540/AII.2.1) The B characters identifying the different transmitter coverage areas and the B
1 2
characters identif
...

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