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International Maritime Organization SN/Circulars

Document Name Description Format Size Date Posted

SN Circ1

Position-Reporting System in the area around Madagascar

 PDF

27 KB

2-03-03

SN Circ2

 Co-ordination of Safety at Sea and in the Air

 PDF

253 KB

2-03-03

SN Circ4

Avoidance of confusion between aeronautical and marine light beacons

 PDF

82 KB

2-03-03

SN Circ7

 Merchant-Ship Position-Reporting Systems- Government of Commonwealth of Australia

PDF

47 KB

2-03-03
SN Circ11

Merchant Ships Position-Reporting System- Government of New Zealand

PDF

 193 KB 2-03-03
SN Circ23

Merchant Ships Position-Reporting System

 PDF 18 KB 2-03-03

SN Circ24

 Light Signals for Vessels engaged in Fishing - Government of Iceland

PDF

100 KB

2-03-03

SN Circ25

Facsimile Transmission of Meteorological Charts

 PDF 110 KB 2-03-03
SN Circ26

 Recommendations for the marking of off-shore structures- International Association of Lighthouse Authorities

 PDF 133 KB 2-03-03

SN Circ27

 Light Signals for Vessels engaged in Fishing - Government of Norway

 PDF

25 KB

 2-03-03
SN Circ28

International Regulations for Preventing collisions at Sea, 1960- The Netherlands Government

 PDF

33 KB

 2-03-03

SN Circ29

Efficiency of Navigation lights

 PDF

70 KB

 2-03-03
SN Circ30

 World Weather Watch - Meteorological Information and Forecast Products

 PDF

74 KB

 2-03-03

SN Circ32

 Report of the first session of the subcommittee on the safety of navigation

PDF

26 KB

 2-03-03
SN Circ33

    Navigation in congested areas- Government of the United States of America

 PDF 91 KB 2-03-03

SN Circ34

 Matters Related to Safety of Navigation- Council

 PDF 40 KB 2-03-03
SN Circ>35

Traffic Separation in the Strait of Dover

 PDF 27 MB 2-03-03
SN Circ36

 Traffic Separation in the Strait of Dover

 PDF 23 KB 2-03-03
SN Circ37

  Establishment of Sea Lanes

 PDF 53 KB 2-03-03
SN Circ38

    Merchant Ship Position-Reporting System- Government of Commonwealth of Australia0

 PDF 17 KB 2-03-03
SN Circ39

Rocket Launching area in the certain sea- Royal Hellenic Government

 PDF 124 KB 2-03-03
SN Circ40

 Signals Indicating the Intention to Maneuver- Experimental use on board certain Netherlands' ships

 PDF 42 KB 2-03-03
SN Circ42

 Marine Traffic Control System in the St. Lawrence River- Government of Canada

 PDF 199 KB 2-03-03
SN Circ43

  Rocket Launching Area in the Certain Sea- Royal Hellenic Government

 PDF 175 KB 2-03-03
SN Circ44 Experimental use of Experimental Signals indicating alteration of course - Netherlands Administration PDF 61 KB 2-03-03
SN Circ45

Notification by the Danish Government of Legislation on Rules for Lights and Shapes to be carried by Vessels towing dracones or by dracones under tow

 PDF 42 KB 2-03-03
SN Circ46

  Experimental use of visual signals indicating alterations of course - Government of Netherlands

 PDF 27 KB 2-03-03
SN Circ47

Unification of local special rules- Lights, shapes, and sound signals used by vessels engaged in dredging

 PDF 24 KB 2-03-03
SN Circ48

Experimental visual maneuvering signals- Government of the Federal Republic of Germany

 PDF 36 KB 2-03-03

SN Circ49

Experimental signal indicating maneuvers

 PDF 41 KB 2-03-03
SN Circ50

Revision of the collision regulations

 PDF 22 KB 2-03-03
SN Circ51

Traffic separation scheme in the straight of Dover

 PDF 19 KB 2-03-03
SN Circ52

Identification for ships having bulbous bow and vessels carrying dangerous goods

 PDF 22 KB 2-03-03
SN Circ53

Rocket Launching area in the Cretan Sea

 PDF 106 KB 2-03-03
SN Circ54

Marine Traffic Control

 PDF 15 KB 2-03-03
SN Circ55

 Traffic separation team in the German bight

 PDF 78 KB 2-03-03
SN Circ56

Traffic Separation System at the approaches to the hook of Holland

 PDF 69 KB 2-03-03
SN Circ57

 Floating Debris

 PDF 18 KB 2-03-03
SN Circ58

Maritime Meteorology

 PDF 40 KB 2-03-03
SN Circ59

 New Traffic Separation Schemes

 PDF 114 KB 2-03-03
SN Circ60

 Coming into effect of the traffic separation scheme in the approaches to Chedasucto Bay

 PDF 80 KB 2-03-03
SN Circ64

Marine Traffic regulation system Nova Scotia, Southeast coast Halifax Harbour and approaches

 PDF 179 KB 2-03-03
SN Circ65

 Marking of wrecks in international waters

 PDF 136 KB 2-03-03
SN Circ66

 Air Sea Rescue in International Waters

 PDF 425 KB 2-03-03
SN Circ67

Use of combined lantern for sailing vessels

 PDF 19 KB 2-03-03
SN Circ68

Revision of the Traffic Separation Scheme in the Saronicos Gulf

 PDF 58 KB 2-03-03
SN Circ69

International Regulations for preventing collisions at Sea-Use of combined lanterns by sailing vessels of less than 12 in length

 PDF 30 KB 2-03-03
SN Circ70

Newarp/Cross Sands Traffic Separation scheme

 PDF 28 KB 2-03-03
SN Circ71

Traffic Separation Scheme in the approaches to Ras Tanura and Ju'ayam

 PDF 92 KB 2-03-03
SN Circ72

Dover Straight Traffic Separation Scheme

 PDF 22 KB 2-03-03
SN Circ73

  Recommended Traffic Separation Scheme in the Gulf of Santa Catalina

 PDF 57 KB 2-03-03
SN Circ74

Provisions for embarkation and disembarkation of pilots in Argentine ports

 PDF 27 KB 2-03-03
SN Circ75

 Proposed and combined cardinal and lateral system of maritime buoyage

 PDF 173 KB 2-03-03
SN Cir76

International regulations for preventing collisions at sea

 PDF 19 KB 2-03-03

SN Circ77

  International Regulations for preventing collisions at Sea-Use of combined lanterns by sailing vessels of less than 12 in length

 PDF 24 KB 2-03-03
SN Circ79

Areas of Training and Exercizes

 PDF 102 KB 2-03-03
SN Circ80

Regional Harmonization of Buoyage system

 PDF 395 KB 2-03-03
SN Circ81

Broadcasts of safety information in the Dover straight

 PDF 38 KB 2-03-03
SN Circ82

Application of Section 9(b) of Annex 1 to the International Regulations for preventing collisions at Sea, 1972

 PDF 57 KB 2-03-03
SN Circ84

German Sea Pilotage Service

 PDF 17 KB 2-03-03
SN Circ85

 Questionnaire on user requirements for radar plotting as an aid to collision avoidance

 PDF 130 KB 2-03-03
SN Circ86

Guidance on the use of VHF on Sea

 PDF 198 KB 2-03-03
SN Circ87

Operational Guidance on the use of Radar Beacons and Transponders

 PDF 343 KB 2-03-03
SN Circ88

 Safety in the Channel:  A Report by the Anglo-French safety of navigation group

 PDF 16 KB 2-03-03
SN Circ89

Regional Harmonization of Buoyage Systems

 PDF 201 KB 2-03-03
SN Circ90 Application of colored Gas in Wheelhouse windows of ships PDF 19 KB 2-03-03
SN Circ91

  Guidance on the use of VHF on Sea

 PDF 184 KB 2-03-03
SN Circ93

 Ship movement reporting systems

 PDF 18 KB 2-03-03
SN Circ94

Guide to the planning and conduct of passages

 PDF 752 KB 2-03-03
SN Circ95

  Recommendations on the determination of the luminous intensity of  marine aid to navigation light

 PDF 979 KB 2-03-03
SN Circ96 Recommendations for the rhythmic characters of lights in aid to marine navigation PDF 13 KB 2-03-03
SN Circ97 Use of adequately qualified deep-sea pilots in the north sea, English channel, and skaggerak PDF 86 KB 2-03-03
SN Circ98 Amendments to the general provisions on ships' routeing PDF 24 KB 2-03-03
SN Circ99  Carriage of up to date charts PDF 19 KB 2-03-03
SN Circ100 Deepwater route of the east coast of Langeland PDF 17 KB 2-03-03
SN Circ101  Areas to be avoided PDF 115 KB 2-03-03
SN Circ102  Amendments the standard marine navigational PDF 85 KB 2-03-03
SN Circ103  Recommendation on Routeing Systems and Safe Navigation in the English Channel and The Dover Straight PDF 51.7 KB 1-23-03
SN Circ104  Avoidance by Passing Ships of the Precautionary Area in the Traffic Separation Scheme in the Approaches to the Hook Of Holland  PDF  112 KB 1-23-03
SN Circ105  IALA Bouyage System  PDF  17.3 KB 1-23-03
SN Circ106  International System of Sea Ice Symbols  PDF  200 KB 1-23-03
SN Circ107  Maritime Bouyage System  PDF  13.3 KB 1-23-03
SN Circ108  Matters related to the 1972 Collision Regulations PDF  50.1 KB 1-23-03
8Rev.1 New Traffic Regulation on Conformity with the International Regulations for Preventing Collisions at Sea 1972, to be established in the strait of Istanbul PDF 53.8 KB 1-23-03
SN Circ109 Omega Radio Navigation Systems PDF 20.4 KB 1-23-03
SN Circ110 SAR Situation Reports PDF 43.8 KB 1-23-03
SN Circ111 Skipping Routes in North Eastern Australian Waters PDF 27.3 KB 1-23-03
SN Circ112 Omega Radio Navigation Systems PDF 22.1 KB 1-23-03
SN Circ113 Baltic Sea Position Reporting PDF 135 KB 1-23-03
SN Circ113Rev.1 Baltic Sea Position Reporting PDF 8.73 KB 1-23-03
SN Circ114 Amendments to the Standard Marine Navigational Vocabulary PDF 92.9 KB 1-23-03
SN Circ115 Amendments to the General Provisions of Ships Routeing PDF 19.1 KB 1-23-03
SN Circ116 Carriage of Masthead lights on board supply ships engaged in offshore activity PDF 37.8 KB 1-23-03
SN Circ117 Mined Area PDF 12.0 KB 1-23-03
SN Circ118 Questionnaire on the use of blue flashing and fixed lights by sea-going vessels and signals to identify patrol vessels PDF 37.3 KB 1-23-03
SN Circ120 IALA Maritime Bouyage System Agreement PDF 250 KB 1-23-03
SN Circ121 Omega Radio navigation System PDF 19.1 KB 1-23-03
SN Circ122 Safety of Navigation PDF 52.2 KB 1-23-03
SN Circ123 International Port Traffic Signals PDF 101 KB 1-23-03
SN Circ123Rev1 International Port Traffic Signals PDF 201 KB 1-23-03
SN Circ125 Safety of Navigation Cable-Laying Operations in the Dover Strait PDF 28.0 KB 1-23-03
SN Circ126 Safety of Navigation PDF 22.6 KB 1-23-03
SN Circ126Add1 Safety of Navigation PDF 51.0 KB 1-23-03
SN Circ127 Amendments to the general provisions on ships' routeing PDF 36.2 KB 1-23-03
SN Circ129 Routeing Systems other than Traffic Separation Schemes PDF 45.3 KB 1-23-03
SN Circ130 Assembly Resolution A.486(XII) Recommendation on the use of Adequately Qualified Deep-Sea Pilots in the North Sea, English Channel and Skagerrak PDF 11.9 KB 1-23-03
SN Circ131 Ship Reporting Systems PDF 35.8 KB 1-23-03
SN Circ132 Electronic Chart Display System PDF 28.2 KB 1-23-03
SN Circ133 Information on Deep-Sea Pilotage in the Baltic Sea PDF 160 KB 1-23-03
SN Circ134 Danish Radio Reporting Service (SHIPPOS) PDF 12.1 KB 1-23-03
SN Circ135 Routeing Systems other than the Traffic Separation Schemes PDF 22.1 KB 1-23-03
SN Circ137 Revised Recommendation on under-keel allowance for deep-draught ships navigating through the English channel and Dover strait PDF 32.8 KB 1-23-03
SN Circ138 Routeing Systems other than Traffic Separation Schemes PDF 32.7 KB 1-23-03
SN Circ139 Recommendation on Navigation through the English channel and the Dover Strait PDF 81.3 KB 1-23-03
SN Circ140 Mariner's Routeing Guide for the Gulf of Suez PDF 107 KB 1-23-03
SN Circ141 Information on a Ship Routeing System in the old Bahamas Channel PDF 121 KB 1-23-03
SN Circ141Rev3 Information on a Ship Routeing System in the old Bahamas Channel PDF 121 KB

1-23-03
SN Circ142 Information on a proposed ship reporting system in the old Bahamas channel PDF 36.6 KB 1-23-03
SN Circ143 Vessel Traffic Information Service in the Singapore Strait PDF 53.4 KB 1-23-03
SN Circ144 Routeing System "Off Friesland" PDF 158 KB 1-23-03
SN Circ145 Routeing Systems other than Traffic Separation Schemes PDF 105 KB 1-23-03
SN Circ146 Fixed Traffic Link Across the Great Belt PDF 249 KB 1-23-03
SN Circ147 Deep-Water Route West of the Hebrides PDF 66.0 KB 1-23-03
SN Circ148 Performance Standards for Radar Reflectors PDF 52.2 KB 1-23-03
SN Circ149 New German Traffic Regulations for Navigable Water ways PDF 25.4 KB 1-23-03
SN Circ150 Traffic Separation Scheme "Off Texel" PDF 22.9 KB 1-23-03
SN Circ151 Information on a Chilean Ship Reporting System (CHILREP) PDF 11.1 KB 1-23-03
SN Circ152 Routeing Systems other than Traffic Separation PDF 24.0 KB 1-23-03
SN Circ152Rev1 Routeing Systems other than Traffic Separation PDF 41.6 KB 1-23-03
SN Circ153 Comments, Evaluations and Proposals to the Provisional Performance Standards on ECDIS PDF 576 KB 1-23-03
SN Circ154 Use of Radar Transponders on ships for safety purposes PDF 22.2 KB 1-23-03
SN Circ155 Amendment to the General Provisions on Ships Routeing PDF 12.2 KB 1-23-03
SN Circ156 World Wide Navigation System PDF 35.0 KB 1-23-03
SN Circ157 Warning on using Non-equivalent Electronic Charts PDF 18.4 KB 1-23-03
SN Circ158 Information on the Omega Radio Navigation System PDF 61.7 KB 1-23-03
SN Circ159 Routeing Systems other than Traffic Separation Schemes PDF 108 KB

1-23-03

 
SN Circ162 Trials in which the officer of the Navigational Watch Acts as the Sole Look-Out in periods of Darkness PDF 222 KB 1-23-03
SN Circ163 Information on particular internal waters entry requirements PDF 564 KB 1-23-03
SN Circ164 Collision in the strait of Istanbul PDF 137 KB 1-23-03
SN Circ165 Collision in the strait of Istanbul PDF 58 KB 1-23-03
SN Circ166 Safety of Navigation PDF 54 KB 1-23-03
SN Circ167 Routeing Systems other than Traffic Separation Schemes PDF 94 KB 1-23-03
SN Circ168 Collisions in the strait of Istanbul PDF 68 KB 1-23-03
SN Circ170 Navigation in the straits PDF 56 KB 1-23-03
SN Circ171 Collision in the Bosphorus Straits PDF 78 KB 1-23-03
SN Circ172 Information on the Singapore Ship Reporting System (SINGREP) PDF 418 KB 1-23-03
SN Circ173 Routeing measures other than traffic separation schemes PDF 46 KB 1-23-03
SN Circ174 Collision in strait Canakkale PDF 42 KB 1-23-03
SN Circ175 Routeing measures other than traffic separation schemes PDF 30 KB 1-23-03
SN Circ176 Amendments to general provisions on ships routeing PDF 174 KB 1-23-03
SN Circ177 Use of "Not Under Command" (NUC Signals) PDF 23 KB 1-23-03
SN Circ178 Information on the Georgian Ship Reporting System (GEOREP) PDF 225 KB 1-23-03
SN Circ179 Carriage of Masthead lights  on board supply ships engaged in offshore activities PDF 17 KB 1-23-03
SN Circ180 Routeing measures other than traffic separation schemes PDF 76 KB 1-23-03
SN Circ181 Compliance with Ships Routeing measures PDF 60 KB 1-23-03
SN Circ183 Routeing measures other than traffic separation schemes PDF 22 KB 1-23-03
SN Circ184 Routeing measures other than traffic separation schemes PDF 115 KB 1-23-03
SN Circ184Corr1 Routeing measures other than traffic separation schemes PDF 23 KB 1-23-03
SN Circ185 Amendments to general provisions on ships routeing PDF 28 KB 1-23-03
SN Circ186 Mandatory Ship Reporting Systems PDF 461 KB 1-23-03
SN Circ187 Recognition of the Global Navigation Satellite System (GLONASS) as a component of the world-wide radio navigation system PDF 26 KB 1-23-03
SN Circ188 Safety of passenger submersible craft PDF 20 KB 1-23-03
SN Circ189 The marking of Seismic Streamers PDF 21 KB 1-23-03
SN Circ190 Information on a prohibited anchorage area in Indonesian Territorial Waters PDF 76 KB 1-23-03
SN Circ191 Information on Safety and Protection of the Maghreb-Europe oil Pipeline PDF 25 KB 1-23-03
SN Circ192 Information on the Construction of a fixed traffic link across the central part of the sound between Denmark and Sweden PDF 194 KB 1-23-03
SN Circ194 Rules and recommendations on navigation through  the strait of Istanbul, strait of Canakkale and the sea of Marmara PDF 46 KB 1-23-03
SN Circ195 Rules and recommendations on navigation through  the strait of Istanbul, strait of Canakkale and the sea of Marmara PDF 44 KB 1-23-03
SN Circ196 Routeing of Ships PDF 14 KB 1-23-03
SN Circ197 Operation of Marine Radar for SART detection PDF 77 KB 1-23-03
SN Circ197Corr1 Operation of Marine Radar for SART detection PDF 10 KB 1-23-03
SN Circ198 Routeing measures other than traffic separation schemes PDF 109 KB 1-23-03
SN Circ198Corr1 Routeing measures other than traffic separation schemes PDF 11 KB 1-23-03
SN Circ199 Amendments to general provisions on ships routeing PDF 188 KB 1-23-03
SN Circ200 Adoption, Designation, and Substitution of Archipelagic Sea Lanes PDF 332 KB 1-23-03
SN Circ201 Mandatory Ship Reporting Systems PDF 290 KB 1-23-03
SN Circ201Corr1 Mandatory Ship Reporting Systems PDF 15 KB 1-23-03


NOTE: The most recent Circulars may also be found at the IMO's website.