COPYRIGHT Danish Standards Foundation. NOT FOR COMMERCIAL USE OR REPRODUCTION. DS/EN :2013

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1 Dansk standard DS/EN udgave Udstyr og systemer til maritim navigation og radiokommunikation Automatiske identifikationssystemer (AIS) Del 2: Skibsinstallerede automatiske identifikationssystemer (AIS) i klasse A Drifts- og ydeevnekrav, prøvningsmetoder og krævede prøvningsresultater Maritime navigation and radiocommunication equipment and systems Automatic Identification Systems (AIS) Part 2: Class A shipborne equipment of the automatic identification system (AIS) Operational and performance requirements, methods of test and required test results

2 DS/EN København DS projekt: M ICS: Første del af denne publikations betegnelse er: DS/EN, hvilket betyder, at det er en europæisk standard, der har status som dansk standard. Denne publikations overensstemmelse er: IDT med: IEC ED 2.0:2012. IDT med: EN :2013. DS-publikationen er på engelsk. Denne publikation erstatter: DS/EN :2002. DS-publikationstyper Dansk Standard udgiver forskellige publikationstyper. Typen på denne publikation fremgår af forsiden. Der kan være tale om: Dansk standard standard, der er udarbejdet på nationalt niveau, eller som er baseret på et andet lands nationale standard, eller standard, der er udarbejdet på internationalt og/eller europæisk niveau, og som har fået status som dansk standard DS-information publikation, der er udarbejdet på nationalt niveau, og som ikke har opnået status som standard, eller publikation, der er udarbejdet på internationalt og/eller europæisk niveau, og som ikke har fået status som standard, fx en teknisk rapport, eller europæisk præstandard DS-håndbog samling af standarder, eventuelt suppleret med informativt materiale DS-hæfte publikation med informativt materiale Til disse publikationstyper kan endvidere udgives tillæg og rettelsesblade DS-publikationsform Publikationstyperne udgives i forskellig form som henholdsvis fuldtekstpublikation (publikationen er trykt i sin helhed) godkendelsesblad (publikationen leveres i kopi med et trykt DS-omslag) elektronisk (publikationen leveres på et elektronisk medie) DS-betegnelse Alle DS-publikationers betegnelse begynder med DS efterfulgt af et eller flere præfikser og et nr., fx DS 383, DS/EN 5414 osv. Hvis der efter nr. er angivet et A eller Cor, betyder det, enten at det er et tillæg eller et rettelsesblad til hovedstandarden, eller at det er indført i hovedstandarden. DS-betegnelse angives på forsiden. Overensstemmelse med anden publikation: Overensstemmelse kan enten være IDT, EQV, NEQ eller MOD IDT: Når publikationen er identisk med en given publikation. EQV: Når publikationen teknisk er i overensstemmelse med en given publikation, men præsentationen er ændret. NEQ: Når publikationen teknisk eller præsentationsmæssigt ikke er i overensstemmelse med en given standard, men udarbejdet på baggrund af denne. MOD: Når publikationen er modificeret i forhold til en given publikation.

3 EUROPEAN STANDARD EN NORME EUROPÉENNE EUROPÄISCHE NORM January 2013 ICS Supersedes EN :2002 English version Maritime navigation and radiocommunication equipment and systems - Automatic Identification Systems (AIS) - Part 2: Class A shipborne equipment of the automatic identification system (AIS) - Operational and performance requirements, methods of test and required test results (IEC :2012) Matériels et systèmes de navigation et de radiocommunications maritimes - Systèmes d'identification automatique (AIS) - Partie 2: Equipements AIS de type Classe A embarqués - Exigences d'exploitation et de fonctionnement, méthodes d'essai et résultats d'essai exigés (CEI :2012) CENELEC European Committee for Electrotechnical Standardization Comité Européen de Normalisation Electrotechnique Europäisches Komitee für Elektrotechnische Normung Navigations- und Funkkommunikationsgeräte und -systeme für die Seeschifffahrt - Automatische Identifikationssysteme (AIS) - Teil 2: Geräte der Klasse A des universellen automatischen Identifikationssystems (AIS) für Schiffe - Betriebs- und Leistungsanforderungen, Prüfverfahren und geforderte Prüfergebnisse (IEC :2012) This European Standard was approved by CENELEC on CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CENELEC member. This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the same status as the official versions. CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. Management Centre: Avenue Marnix 17, B Brussels 2013 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN :2013 E

4 EN : Foreword The text of document 80/656/CDV, future edition 2 of IEC , prepared by IEC TC 80 "Maritime navigation and radiocommunication equipment and systems" was submitted to the IEC-CENELEC parallel vote and approved by CENELEC as EN :2013. The following dates are fixed: latest date by which the document has to be implemented at national level by publication of an identical national standard or by endorsement latest date by which the national standards conflicting with the document have to be withdrawn This document supersedes EN :2002. (dop) (dow) EN :2013 includes the following significant technical changes with respect to EN :2002: It incorporates the technical characteristics included in Recommendation ITU-R M , which was published in New technical characteristics result in sundry clarifications to the requirements and the ability to handle five new messages Messages 23, 24, 25, 26 and 27. The significant changes in this edition include: a new requirement in 6.9 for vessels of type tanker to use a low power setting; expanded requirements for the functionality of the minimum keyboard and display in 6.11 including new requirements for display of AIS-SART together with an AIS-SART alarm and new requirements for the protection of the static data of the ship; expanded requirements for the transmitters and receivers in 7.2 but with the removal of the previous requirement for 12,5 khz channel operation which has not been used in practice; expanded requirements for long-range applications in Clause 8 to add a broadcast method; a definition of the pilot plug pin out in 7.6 together with some new requirements for interfaces; extensively revised test methods in Clauses 14 to 19 based on the experience of testing AIS equipment; expanded test methods in Annex D for DSC functionality but the removal of the previous requirement for DSC polling which is no longer used. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CENELEC [and/or CEN] shall not be held responsible for identifying any or all such patent rights.

5 - 3 - EN :2013 Endorsement notice The text of the International Standard IEC :2012 was approved by CENELEC as a European Standard without any modification. In the official version, for Bibliography, the following notes have to be added for the standards indicated: IEC NOTE Harmonized as EN IEC NOTE Harmonized as EN IEC NOTE Harmonized as EN IEC NOTE Harmonized as EN IEC NOTE Harmonized as EN IEC NOTE Harmonized as EN IEC NOTE Harmonized as EN IEC NOTE Harmonized as EN ISO 9000 series NOTE Harmonized in EN ISO 9000 series.

6 EN : Annex ZA (normative) Normative references to international publications with their corresponding European publications The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. NOTE When an international publication has been modified by common modifications, indicated by (mod), the relevant EN/HD applies. Publication Year Title EN/HD Year IEC corr. April IEC Maritime navigation and radiocommunication equipment and systems - General requirements - Methods of testing and required test results Series Maritime navigation and radiocommunication equipment and systems - Global navigation satellite systems (GNSS) IEC Maritime navigation and radiocommunication equipment and systems - Digital interfaces - Part 1: Single talker and multiple listeners IEC Maritime navigation and radiocommunication equipment and systems - Digital interfaces - Part 2: Single talker and multiple listeners, high-speed transmission IEC Maritime navigation and radiocommunication equipment and systems - Presentation of navigation-related information on shipborne navigational displays - General requirements, methods of testing and required test results EN EN EN EN EN IEC Maritime navigation and radio-communication EN equipment and systems - Shipborne radar - Performance requirements, methods of testing and required test results IMO Resolution A.694(17) IMO Resolution MSC.74(69) IMO Resolution MSC.43(64) ITU-R Recommendation M ITU-R Recommendation M General requirements for shipborne radio equipment forming part of the global maritime distress and safety system (GMDSS) and for electronic navigational aids - Recommendations on performance standards for Track control systems - Guidelines and Criteria for Ship Reporting Systems (as amended by MSC.111(73)) - Technical characteristics for an automatic identification system using time-division multiple access in the VHF maritime mobile band Characteristics of a transponder system using - - digital selective calling techniques for use with vessel traffic services and ship-to-ship identification Series

7 - 5 - EN :2013 Publication Year Title EN/HD Year ITU-R Recommendation M Digital selective-calling system for use in the maritime mobile service - - ITU-T Recommendation O.153 ITU-R Recommendation M ITU-R Recommendation M Basic parameters for the measurement of error performance at bit rates below the primary rate - Interim solutions for improved efficiency in the use of the band MHz by stations in the maritime mobile service - Operational procedures for the use of digital selective-calling equipment in the maritime mobile service

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9 INTERNATIONAL STANDARD IEC Edition Maritime navigation and radiocommunication equipment and systems Automatic identification systems (AIS) Part 2: Class A shipborne equipment of the automatic identification system (AIS) Operational and performance requirements, methods of test and required test results IEC :2012(E)

10 IEC:2012(E) CONTENTS FOREWORD... 9 INTRODUCTION Scope Normative references Abbreviations General requirements General Overview General requirements Capabilities of the AIS Additional requirements Transmitter shutdown procedure Quality assurance Modes of operation Manuals Marking and identification Other requirements Environmental, power supply, special purpose and safety requirements Display of information Performance requirements Composition Time and position Source for UTC Source for AIS position reporting User interface Identification Information Information provided by the AIS Information reporting intervals Ship reporting capacity Event log Permissible initialization period Power supply Technical characteristics Alarms and indications, fall-back arrangements Built-in test equipment Alarm messages Status messages Display, input and output Minimum keyboard and display (MKD) Communication test Alarms and status information Data protection Distance calculation Protection from invalid controls Technical requirements... 30

11 IEC:2012(E) General Physical layer General Transmitter parameters Receiver parameters Link layer General Link sublayer 1: Medium Access Control (MAC) Link sublayer 2: Data Link Service (DLS) Link sublayer 3 Link Management Entity (LME) Network layer General Management of regional operating settings Transport layer Presentation interface General Automatic input of sensor data High speed input/output ports Long-range communication ports BIIT alarm output Long-range applications General Long-range application by two-way interface General Interrogations and responses Manual and automatic response Data formats and contents Addressing AIS-units Long-range application by broadcast Test conditions Normal and extreme test conditions Normal test conditions Extreme test conditions Standard test environment Additional test arrangements Arrangements for test signals applied to the receiver input Encoder for receiver measurements Waiver for receivers Impedance Artificial antenna (dummy load) Facilities for access Modes of operation of the transmitter Common test conditions for protection from invalid controls Measurement uncertainties Test signals Standard test signal number 1 (DSC) Standard test signal number 2 (TDMA) Standard test signal number 3 (TDMA) Standard test signal number 4 (PRBS)... 48

12 IEC:2012(E) 10.5 Standard test signal number 5 (PRBS) Power supply, special purpose and safety tests Environmental tests EMC tests Operational tests Identification and operating modes Autonomous mode Assigned mode Polled mode Addressed operation Broadcast operation Multiple slot messages Information Information provided by the AIS Reporting intervals Event log Method of measurement Required results Initialization period Method of measurement Required results Technical characteristics Channel selection Transceiver protection Automatic power setting Alarms and indicators, fall-back arrangements Loss of power supply Monitoring of functions and integrity Monitoring of sensor data Display, input and output Data input/output facilities Initiate message transmission Communication test System control Display of received targets Display of position quality Display of targets if optional filter is implemented Display of received safety related messages Presentation of navigation information Physical tests TDMA transmitter Frequency error Carrier power Slotted transmission spectrum Modulation accuracy Transmitter output power characteristics TDMA receivers Sensitivity... 70

13 IEC:2012(E) Error behaviour at high input levels Co-channel rejection Adjacent channel selectivity Spurious response rejection Intermodulation response rejection and blocking Transmit to receive switching time Immunity to out-of-band energy Conducted spurious emissions Spurious emissions from the transmitter Spurious emissions from the receiver Specific tests of link layer TDMA synchronisation Synchronisation test using UTC Synchronisation test using UTC with repeated messages Synchronisation test without UTC, semaphore Synchronisation test without UTC Reception of un-synchronised messages Time division (frame format) Method of measurement Required results Synchronisation and jitter accuracy Definition Method of measurement Required results Data encoding (bit stuffing) Method of measurement Required results Frame check sequence Method of measurement Required results Slot allocation (channel access protocols) Network entry Autonomous scheduled transmissions (SOTDMA) Autonomous scheduled transmissions (ITDMA) Safety related/binary message transmission Transmission of Message 5 (ITDMA) Assigned operation Group assignment Fixed allocated transmissions (FATDMA) Randomisation of message transmissions Message formats Received messages Transmitted messages Specific tests of network layer Dual channel operation Alternate transmissions Method of measurement Required results Regional area designation by VDL message Method of measurement... 89

14 IEC:2012(E) Required results Regional area designation by serial message Regional area designation with lost position Method of measurement Required results Power setting Method of measurement Required results Message priority handling Method of measurement Required results Slot reuse and FATDMA reservations Method of measurement Required results Management of received regional operating settings Test for replacement or erasure of dated or remote regional operating settings Test of correct input via presentation interface or MKD Test of addressed telecommand Test for invalid regional operating areas Continuation of autonomous mode reporting interval Method of test Required results Specific tests of transport layer Addressed messages Transmission Acknowledgement Transmission retry Acknowledgement of addressed safety related messages Behaviour of NavStatus 14 reception Interrogation responses Method of measurement Required results Specific presentation interface tests General Checking manufacturer's documentation Electrical test Method of test Required results Test of input sensor interface performance Method of measurement Required results Test of sensor input Test of GNS input Test of RMC input Test of DTM input Test of GBS input Test of VBW input Test of VTG input

15 IEC:2012(E) Test of HDT/THS input Test of ROT input Test of different inputs Test of multiple inputs Test of high speed output Method of measurement Required results High speed output interface performance Method of measurement Required results Output of undefined VDL messages Method of measurement Required results Test of high speed input Method of measurement Required results Long-range functionality tests Long-range application by two-way interface LR interrogation LR "all ships" interrogation Consecutive LR all ships interrogations Long-range application by broadcast Long-range broadcast Multiple assignment operation Annex A (informative) Block diagram of AIS Annex B (normative) AIS interface overview (see Table 13) Annex C (informative) Block diagram of standard test environment Annex D (normative) DSC functionality Annex E (informative) Optional PI port sentences Annex F (informative) Alarm handling Annex G (normative) Calculation of area size and distance Annex H (normative) Transmission of binary Messages 25 and Bibliography Figure 1 OSI layer model Figure 2 Power versus time characteristics Figure 3 Format for repeating four-packet cluster Figure 4 Measurement arrangement for frequency error Figure 5 Measurement arrangement for carrier power Figure 6 Emission mask for slotted transmission Figure 7 Measurement arrangement for modulation accuracy Figure 8 Measurement arrangement Figure 9 Measurement arrangement with two generators Figure 10 SINAD or PER/BER measuring equipment Figure 11 Test set-up Figure 12 Transmit to receive switching time measurement setup... 76

16 IEC:2012(E) Figure 13 Regional area scenario Figure D.1 Measurement arrangement for inter-modulation Table 1 Information reporting intervals for autonomous mode Table 2 Integrity alarm conditions signalled using ALR sentence formatter Table 3 Sensor status indications signalled using TXT sentence formatter Table 4 Position sensor fallback conditions Table 5 Use of accuracy (PA) flag Table 6 ROT sensor fallback conditions Table 7 Message display on MKD Table 8 Position quality Table 9 Transmitter parameters Table 10 Power versus time characteristics Table 11 Receiver parameters Table 12 Use of VDL messages Table 13 Presentation interface access Table 14 IEC sensor sentences Table 15 AIS High-speed input data and formats Table 16 AIS high-speed output data and formats Table 17 AIS Long-range communications input data and formats Table 18 LR output data formats Table 19 LR data types Table 20 Content of first two packets Table 21 Fixed PRS data derived from Recommendation ITU-T O Table 22 Peak frequency deviation versus time Table 23 Tests to be performed Table 24 Primary channels for each region Table E.1 Property identifier Table G.1 Coordinate points

17 IEC:2012(E) 9 INTERNATIONAL ELECTROTECHNICAL COMMISSION MARITIME NAVIGATION AND RADIOCOMMUNICATION EQUIPMENT AND SYSTEMS AUTOMATIC IDENTIFICATION SYSTEMS (AIS) Part 2: Class A shipborne equipment of the automatic identification system (AIS) Operational and performance requirements, methods of test and required test results FOREWORD 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international co-operation on all questions concerning standardization in the electrical and electronic fields. To this end and in addition to other activities, IEC publishes International Standards, Technical Specifications, Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as IEC Publication(s) ). Their preparation is entrusted to technical committees; any IEC National Committee interested in the subject dealt with may participate in this preparatory work. International, governmental and nongovernmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely with the International Organization for Standardization (ISO) in accordance with conditions determined by agreement between the two organizations. 2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international consensus of opinion on the relevant subjects since each technical committee has representation from all interested IEC National Committees. 3) IEC Publications have the form of recommendations for international use and are accepted by IEC National Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any misinterpretation by any end user. 4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications transparently to the maximum extent possible in their national and regional publications. Any divergence between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in the latter. 5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any services carried out by independent certification bodies. 6) All users should ensure that they have the latest edition of this publication. 7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and members of its technical committees and IEC National Committees for any personal injury, property damage or other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC Publications. 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. International Standard IEC has been prepared by IEC technical committee 80: Maritime navigation and radiocommunication equipment and systems. This second edition cancels and replaces the first edition, published in This edition constitutes a technical revision. This edition includes the following technical changes with respect to the previous edition: It incorporates the technical characteristics included in Recommendation ITU-R M which was published in New technical characteristics result in sundry clarifications to the requirements and the ability to handle five new messages Messages 23, 24, 25, 26 and 27.

18 IEC:2012(E) The significant changes in this edition include: a new requirement in 6.9 for vessels of type tanker to use a low power setting; expanded requirements for the functionality of the minimum keyboard and display in 6.11 including new requirements for display of AIS-SART together with an AIS-SART alarm and new requirements for the protection of the static data of the ship; expanded requirements for the transmitters and receivers in 7.2 but with the removal of the previous requirement for 12,5 khz channel operation which has not been used in practice; expanded requirements for long-range applications in Clause 8 to add a broadcast method; a definition of the pilot plug pin out in 7.6 together with some new requirements for interfaces; extensively revised test methods in Clauses 14 to 19 based on the experience of testing AIS equipment; expanded test methods in Annex D for DSC functionality but the removal of the previous requirement for DSC polling which is no longer used. The text of this standard is based on the following documents: CDV 80/656/CDV Report on voting 80/675/RVC Full information on the voting for the approval of this standard can be found in the report on voting indicated in the above table. This publication has been drafted in accordance with the ISO/IEC Directives, Part 2. The committee has decided that the contents of this publication will remain unchanged until the stability date indicated on the IEC web site under " 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 publication may be issued at a later date.

19 IEC:2012(E) 11 INTRODUCTION In comparison with the previous edition of this Standard, the structural changes to the document are that the original Clause 8 on DSC compatibility together with the corresponding tests in Clause 20 have been moved into a new Annex D. A new Clause on test signals has been added as Clause 10. The original Annex B detailing IEC sentences has been deleted and replaced with a new Annex H, noting that much of this information is now included in IEC The original Annex C describing long-range applications has also been deleted as IMO has decided to adopt a different system for long-range identification and tracking. A new Annex E has been added to describe optional presentation interface port sentences, a new Annex F has been added on alarm handling and a new Annex G has been added on calculation of area size and distance.

20 IEC:2012(E) MARITIME NAVIGATION AND RADIOCOMMUNICATION EQUIPMENT AND SYSTEMS AUTOMATIC IDENTIFICATION SYSTEMS (AIS) Part 2: Class A shipborne equipment of the automatic identification system (AIS) Operational and performance requirements, methods of test and required test results 1 Scope This part of IEC specifies the minimum operational and performance requirements, methods of testing and required test results conforming to performance standards adopted by the IMO in Resolution MSC.74(69), Annex 3, Shipborne Automatic Identification System. This standard incorporates the applicable technical characteristics of Class A shipborne equipment included in Recommendation ITU-R M and takes into account the ITU Radio Regulations, where applicable. In addition, it takes account of IMO Resolution A.694(17) to which IEC is associated. When a requirement in this standard is different from IEC 60945, the requirement of this standard takes precedence. This part of IEC also specifies the minimum requirements both for the means to input and display data and for the interfaces to other equipment suitable to be used as means of input and display data. NOTE All text of this standard, that is identical to that in IMO resolution MSC.74(69), Annex 3 or to that in ITU-R Recommendation M is printed in italics and references to the resolution (abbreviated to "A3") or the recommendation (abbreviated to "M.1371") and paragraph numbers are indicated in parentheses, for instance (A3/3.3) or (M.1371/A2-3.3) respectively. 2 Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. IEC 60945:2002, Maritime navigation and radiocommunication equipment and systems General requirements Methods of testing and required test results IEC (all parts), Maritime navigation and radiocommunication equipment and systems Global navigation satellite systems (GNSS) IEC , Maritime navigation and radiocommunication equipment and systems Digital interfaces Part 1: Single talker and multiple listeners IEC , Maritime navigation and radiocommunication equipment and systems Digital interfaces Part 2: Single talker and multiple listeners, high-speed transmission IEC 62288, Maritime navigation and radiocommunication equipment and systems Presentation of navigation-related information on shipborne navigational displays General requirements, methods of testing and required test results IEC 62388, Maritime navigation and radiocommunication equipment and systems Shipborne radar Performance requirements, methods of testing and required test results

21 IEC:2012(E) 13 IMO Resolution A.694(17), 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.43(64), as amended by MSC.111(73), Guidelines and Criteria for Ship Reporting Systems IMO Resolution MSC.74(69) Annex 3, Recommendation on performance standards for AIS ITU-R Recommendation M , Digital selective-calling system for the use in the maritime mobile service ITU-R Recommendation M.541-9, Operational procedures for the use of digital selectivecalling (DSC) equipment in the maritime mobile service ITU-R Recommendation M.825-3, Characteristics of a transponder system using digital selective calling techniques for use with vessel traffic services and ship-to-ship identification ITU-R Recommendation M , Interim solutions for improved efficiency in the use of the band MHz by stations in the maritime mobile service ITU-R Recommendation M , Technical characteristics for an automatic identification system using time division multiple access in the VHF maritime mobile band ITU-T Recommendation O.153, Basic parameters for the measurement of error performance at bit rates below the primary rate 3 Abbreviations AIS automatic identification system AIS-SART AIS search and rescue transmitter BIIT built-in integrity tests BT bandwidth-time COG course over ground CommState communication state (see NOTE 1) NOTE 1 Communication state is defined in Recommendation ITU-R M It is used to indicate whether the AIS is using the message structure for SOTDMA or ITDMA. ECDIS electronic chart display and information system EPFS electronic position-fixing systems ETA estimated time of arrival EUT equipment under test FATDMA fixed access time division multiple access GMSK Gaussian minimum shift keying HDG Heading IMO International Maritime Organization ITDMA incremental time division multiple access LR long-range MAC medium access control MKD minimum keyboard and display MMSI maritime mobile service identity