111:
the upper and lower boundaries for the Polar
Classes, it was agreed that the highest Polar Class vessels (PC 1) should be capable of operating safely anywhere in the Arctic or the Antarctic waters at any time of the year while the lower boundary was set to existing tonnage operating during the summer season, most of which followed the Baltic ice classes with some upgrades and additions. The lowest Polar Class (PC 7) was thus set to the similar level with the Finnish-Swedish ice class 1A. The definition of operational conditions for each Polar Class was intentionally left vague due to the wide variety of ship operations carried out in polar waters.
650:
470:
38:
304:
133:. These definitions are intended to guide owners, designers and administrations in selecting the appropriate Polar Class to match the intended voyage or service of the vessel. Ships with sufficient power and strength to undertake "aggressive operations in ice-covered waters", such as escort and ice management operations, can be assigned an additional notation "
110:
Prior to the development of the unified requirements, each classification society had their own set of ice class rules ranging from Baltic ice classes intended for operation in first-year ice to higher vessel categories, including icebreakers, intended for operations in polar waters. When developing
275:
The IACS Polar Class rules apply for ships contracted for construction on or after 1 July 2007. This means that while vessels built prior to this date may have an equivalent or even higher level of ice strengthening, they are not officially assigned a Polar Class and may not in fact fulfill all the
250:
In the Polar Class rules, the hull of the vessel is divided longitudinally into four regions: "bow", "bow intermediate", "midbody" and "stern". All longitudinal regions except the bow are further divided vertically into "bottom", "lower" and "icebelt" regions. For each region, a design ice load is
262:
In addition to structural details, the Polar Class rules have requirements for machinery systems such as the main propulsion, steering gear, and systems essential for the safety of the crew and survivability of the vessel. For example, propeller-ice interaction should be taken into account in the
124:
The IACS has established seven different Polar Class notations, ranging from PC 1 (highest) to PC 7 (lowest), with each level corresponding to operational capability and strength of the vessel. The description of ice conditions where ships of each Polar Class are intended to operate are
101:
The development of the Polar Class rules began in the 1990s with an international effort to harmonize the requirements for marine operations in the polar waters in order to protect life, property and the environment. The guidelines developed by the
International Maritime Organization (IMO), which
266:
Although the rules generally require the ships to have suitable hull form and sufficient propulsion power to operate independently and at continuous speed in ice conditions corresponding to their Polar Class, the ice-going capability requirements of the vessel are not clearly defined in terms of
106:
developed by the
International Association of Classification Societies (IACS). In May 1996, an "Ad-Hoc Group to establish Unified Requirements for Polar Ships (AHG/PSR)" was established with one working group concentrating on the structural requirements and another working on machinery-related
144:(1A Super and 1A, respectively). However, unlike the Baltic ice classes intended for operation only in first-year sea ice, even the lowest Polar Classes consider the possibility of encountering multi-year ice ("old ice inclusions").
2449:
496:
4 requirements. However, the 228 metres (748 ft) long and 42 metres (138 ft) wide vessel does not feature an icebreaking hull and is designed to operate primarily in pre-broken ("managed") ice.
558:
class notation "Icebreaker(+)". The latter part of the notation refers to additional structural strengthening based on analysis of the vessel's operational profile and potential ice loading scenarios.
687:
in 2016. The 206.3 metres (677 ft) long and 43 metres (141 ft) wide vessels, capable of breaking up to 1.5-metre (5 ft) ice independently, were built for year-round transportation of
263:
propeller design, cooling systems and sea water inlets should be designed to work also in ice-covered waters, and the ballast tanks should be provided with effective means of preventing freezing.
877:, has been delayed by several years and now isn't expected to be delivered to the U.S. Coast Guard until at least 2028. While the vessels these Polar Security Cutters are intended to replace,
82:(IACS). Seven Polar Classes are defined in the rules, ranging from PC 1 for year-round operation in all polar waters to PC 7 for summer and autumn operation in thin first-year ice.
437:
431:
259:
of structural elements such as shell plating and frames in each location. The design scenario used to determine the ice loads is a glancing collision with a floating ice floe.
684:
2063:
1590:
1016:
2166:
2374:
2438:
1108:
Finnish ice classes equivalent to class notations of recognized classification societies and documentation required for the determination of the ice classes of ships
276:
requirements in the unified requirements. In addition, particularly
Russian ships and icebreakers are assigned ice classes only according to the requirements of the
871:
86:
2416:
79:
2471:
612:
1899:"AUDAX and PUGNAX, Unique PC-3 Class Heavy Transport Vessels Designed for Module Transportation for LNG Liquefaction Projects in Arctic Remote Locations"
1039:
717:
1277:
267:
speed or ice thickness. In practice, this means that the Polar Class of the vessel may not reflect the actual icebreaking capability of the vessel.
906:
1728:
679:
673:
488:
1059:
2260:
1107:
447:
309:
2037:
751:(AHTS) for Alaskan operations. However, the construction of the vessels due for delivery by the end of 2016 was later cancelled following
520:
453:
369:
1564:
2399:
851:. The 270-passenger vessel, capable of breaking up to 2.5 metres (8 ft) thick multi-year ice and taking passengers to the
916:
2 rating with an additional notation "Icebreaker(+)". While a single vessel was initially scheduled for delivery in 2017, the
702:
277:
251:
calculated based on the dimensions, hull geometry, and ice class of the vessel. This ice load is then used to determine the
2144:
2085:
1898:
1013:
920:
has since been revised to include two such icebreakers, the first of which is planned to enter service by
December 2029.
90:
1757:
30:
This article is about ice class. For ships or projects referred to as polar icebreakers or Polar-class icebreakers, see
479:, built in 2016, is rated Polar Class 4 with an additional notation "Icebreaker(+)" denoting additional strengthening.
1086:
779:
748:
352:
126:
31:
1779:
2352:
2167:"RSV Nuyina, the world's first-ever Polar Class 3 Icebreaker Plus vessel equipped with our heaviest rudder system"
1684:
623:
2307:
1220:
917:
1805:
1110:. Maritime Safety Regulation TRAFI/31299/03.04.01.00/2010, Finnish Transport Safety Agency, 23 November 2010.
867:
789:
17:
1288:
1662:
1168:
405:
1479:
649:
2375:"GAO: Polar Security Cutter Design Won't Complete Until 2024, Delivery of First Hull Estimated in 2028"
878:
338:
859:
769:
660:
141:
1591:"Otson kylkiin terästä, kannelle helikopterikenttä ja vesiallas – miehistölle arktiset palkanlisät"
1056:
412:
2504:
2004:
1971:
1938:
562:
140:
The two lowest Polar
Classes (PC 6 and PC 7) are roughly equivalent to the two highest
2338:
Coast Guard Polar
Security Cutter (Polar Icebreaker) Program: Background and Issues for Congress
2286:
602:
892:
541:
4 level to allow the vessel to support seismic surveys in the Arctic during the summer months.
71:
1083:"Guide to meteorological instruments and methods of observation: Sea Ice Nomenclature, 7th ed"
2524:
2336:
2192:
1864:
1831:
1531:
1498:
1449:
1346:
1313:
1123:
843:
688:
469:
2496:
2529:
583:
545:
474:
442:
419:
384:
8:
1057:
History Files (HF) and
Technical Background (TB) documents for Unified Requirements (URs)
848:
763:
654:
576:
555:
365:
37:
2038:"Rolls-Royce to supply propulsion and deck machinery to a new vessel for Edison Chouest"
2439:"Federal government soliciting pitches from Canadian shipyards to build new icebreaker"
2226:
2110:
1914:
1613:
1415:
1380:
1243:
1190:
975:
569:
1082:
225:
Summer/autumn operation in medium first-year ice which may include old ice inclusions
1918:
532:
398:
377:
1647:"Chapter 2 Ice Operations - Ice Class - Section 12 Requirements for Icebreaker(+)",
236:
Summer/autumn operation in thin first-year ice which may include old ice inclusions
192:
Year-round operation in second-year ice which may include multi-year ice inclusions
2534:
1906:
723:
641:
in the 2020s and 2030s, and the first vessel is expected to enter service in 2028.
391:
327:
283:
Although numerous ships have been built to the two least hardened Polar
Classes, PC
214:
Year-round operation in medium first-year ice which may include old ice inclusions
43:
280:, which maintains its own ice class rules parallel to the IACS Polar Class rules.
203:
Year-round operation in thick first-year ice which may include old ice inclusions
1156:
1063:
1020:
885:
318:
102:
were later incorporated in the Polar Code, made reference to the compliance with
2016:
1983:
1950:
1066:. International Association of Classification Societies (IACS), December 2016.
737:
598:
513:
303:
1706:
2518:
2239:
2123:
1897:
van
Lievenoogen, Rinse; Hovilainen, Mika; Valtonen, Ville (1 November 2018),
1626:
1428:
1393:
1256:
1199:
899:
509:
458:
1023:. International Association of Classification Societies (IACS), April 2016.
630:
4 Icebreaker(+). The first icebreaker is expected to enter service in 2027.
691:
524:. The 28,000-tonne vessels are primarily used to transport nickel ore from
358:
928:
As of 2024, no ships have been built, under construction or planned to PC
813:
807:
713:
633:
The new Canadian Coast Guard Multi-Purpose Vessels (MPV) will be rated PC
525:
345:
332:
256:
2261:"MSV Fennica and MSV Nordica now Polar Code certified with PC3 notation"
852:
783:
774:
706:
418:
are under construction. Two additional ships have been ordered for the
252:
134:
1565:"Fednav Welcomes the MV Arvik I - Its Newest Icebreaking Bulk Carrier"
1910:
752:
743:
In April 2015, it was reported that Edison Chouest would build two PC
729:
484:
368:
awarded a shipbuilding contract for the construction of six to eight
321:
intended for scientific missions in the polar regions are built to PC
63:
2443:
822:
3 rating as part of the vessels' Polar Code certification in 2019.
710:
1896:
695:
638:
590:
4 rating as part of the vessels' conversion to Canadian service.
107:
issues. The first IACS Polar Class rules were published in 2007.
1649:
Rules and Regulations for the Classification of Ships, July 2021
758:
As of 2023, three polar research vessels have been built with PC
1041:
Polar Ship Design Standards – State of the Art, and Way Forward
803:
notation includes Lloyd's Register's "Icebreaker(+)" notation.
501:
291:
7, only a small number of ships have been assigned ice class PC
2499:, International Association of Classification Societies (IACS)
1707:"Japan to build new icebreaker for researching Arctic region"
716:
built in 2016–2019 as well as the arctic condensate tankers
313:
is a small expedition cruise ship with Polar Class 5 rating.
2145:"China Launches Domestically-Built "Xue Long 2" Icebreaker"
626:
is in the process of acquiring 2–3 new icebreakers rated PC
181:
Year-round operation in moderate multi-year ice conditions
67:
2472:"Polar icebreakers and the National Shipbuilding Strategy"
2400:
LR to class versatile icebreaker for Canadian Coast Guard
2204:
1876:
1843:
1543:
1510:
1457:
1358:
1325:
1223:. The Royal Institution of Naval Architects. January 2017
1135:
601:
intended to complement the country's existing icebreaker
157:
895:, these mid-1970s icebreakers do not carry a PC rating.
841:
2 rated vessel in service is the expedition cruise ship
531:
In 2015, the hull of the Finnish 1986-built icebreaker
85:
The IACS Polar Class rules should not be confused with
619:
4 rated icebreaker for researching the Arctic region.
87:
International Code for Ships Operating in Polar Waters
425:
As of 2023, four cruise ships have been built with PC
80:
International Association of Classification Societies
796:
also has the additional notation "Icebreaker" while
613:
Japan Agency for Marine-Earth Science and Technology
41:The 2012-built South African polar research vessel
2341:, Congressional Research Service, 28 February 2022
2225:
2109:
1612:
1414:
1379:
1242:
1189:
898:The future Canadian Coast Guard polar icebreakers
637:4 Icebreaker(+). Sixteen vessels will be built by
195:Up to 2.5 m (8.2 ft) and sometimes more
2474:(Press release). Government of Canada. 6 May 2021
1221:"Planet ice and the dual-functional Attenborough"
615:(JAMSTEC) is in the process of acquiring a new PC
2516:
1685:"Argentina funds construction of new icebreaker"
932:1, the highest ice class specified by the IACS.
2064:"Chouest said to have canceled Arctic AHTS duo"
866:2 rated heavy polar icebreakers referred to as
2414:
2408:
1477:
653:The Polar Class 3 icebreaking research vessel
2505:"Ice Class Rules: Description and Comparison"
2415:Newbury, Scott; McGreer, Dan (October 2014).
1287:. Naval Association of Canada. Archived from
1758:"Sjöfartsverket: Första nya isbrytaren 2027"
1478:Hals, Torbjørn; Efraimsson, Fredrik (2011),
818:, built in the early 1990s, were assigned PC
755:'s decision to halt Arctic oil exploration.
608:in Antarctica is currently in design stage.
2430:
2353:"USCG PSC Equals meaningful Polar Presence"
1760:(in Swedish). Aftonbladet. 11 November 2022
2497:Unified Requirements for Polar Class ships
2436:
2393:
1780:"Multi-Purpose Vessel Designed for Canada"
1729:"Baltic Sea icebreaker sets new benchmark"
1101:
1034:
1032:
1014:Unified Requirements for Polar Class ships
537:was reinforced with additional steel to PC
397:is undergoing post-acceptance trials, and
76:Unified Requirements for Polar Class Ships
2367:
1663:"Feature: A Canadian Coast Guard upgrade"
1050:
170:Year-round operation in all polar waters
2464:
671:3 vessels were two heavy load carriers,
648:
468:
302:
239:30 to 70 cm (0.98 to 2.30 ft)
119:
36:
1029:
862:has ordered two out of three planned PC
582:, built in 2000–01 and acquired by the
492:has a hull strengthened according to PC
228:70 to 120 cm (2.3 to 3.9 ft)
217:70 to 120 cm (2.3 to 3.9 ft)
184:Up to 3.0 m (9.8 ft) or more
14:
2517:
701:Although usually referred to by their
153:Ice descriptions in Polar Class rules
2502:
2308:"Le Commandant Charcot in ice trials"
1481:DP Ice Model Test of Arctic Drillship
1077:
1075:
806:The Finnish multipurpose icebreakers
703:Russian Maritime Register of Shipping
278:Russian Maritime Register of Shipping
2437:Berthiaume, Lee (29 February 2020).
2147:. High North News. 11 September 2018
1905:, OTC Arctic Technology Conference,
1009:
1007:
1005:
1003:
1001:
999:
997:
995:
870:. Construction of the first vessel,
829:3 rated vessels under construction.
270:
104:Unified Requirements for Polar Ships
1278:"Arctic and Offshore Patrol Vessel"
544:The Finnish LNG-powered icebreaker
473:The Finnish LNG-powered icebreaker
370:Arctic Offshore Patrol Ships (AOPS)
156:Corresponding ice thickness in the
91:International Maritime Organization
24:
2452:from the original on 10 March 2020
1709:. The Asahi Shimbun. 12 April 2021
1285:Naval Affairs Program Briefing #14
1072:
749:anchor handling tug supply vessels
683:, built for the Netherlands-based
47:is one of the few vessels rated PC
25:
2546:
2490:
2417:"Vessel report: Polar icebreaker"
2287:"Le Commandant Charcot delivered"
1087:World Meteorological Organization
992:
974:Propulsion units strengthened to
780:Polar Research Institute of China
127:World Meteorological Organization
32:polar icebreaker (disambiguation)
1487:, Dynamic Positioning Conference
923:
832:
644:
597:4 polar logistics vessel of the
464:
298:
2345:
2329:
2300:
2279:
2253:
2218:
2185:
2159:
2137:
2102:
2078:
2056:
2030:
1997:
1964:
1931:
1890:
1857:
1824:
1798:
1772:
1750:
1721:
1699:
1687:. Defense Brief. 1 January 2022
1677:
1655:
1640:
1605:
1583:
1557:
1524:
1491:
1471:
1442:
1407:
1372:
1339:
1306:
1270:
1235:
1213:
968:
955:
891:, are sometimes referred to as
847:operated by the French company
709:, the fifteen first-generation
624:Swedish Maritime Administration
245:
206:Over 120 cm (3.9 ft)
2355:. MarineLink. 14 November 2019
1349:National Geographic Resolution
1182:
1149:
1116:
942:
918:National Shipbuilding Strategy
500:The Canadian shipping company
438:National Geographic Resolution
357:is under construction for the
13:
1:
2086:"Kronprins Haakon Ice Trials"
1316:National Geographic Endurance
985:
790:Australian Antarctic Division
432:National Geographic Endurance
114:
96:
2503:Daley, Claude (April 2014).
2066:. MarineLog. 9 November 2015
1903:Day 1 Mon, November 05, 2018
1786:. Aker Arctic. March 8, 2023
1593:. Talouselämä. 10 April 2015
685:ZPMC-Red Box Energy Services
586:2018, will be upgraded to PC
550:, built in 2016, is rated PC
325:5 rating: the South African
7:
1665:. Drydock. 3 September 2019
1169:American Bureau of Shipping
825:As of 2023, there are no PC
142:Finnish-Swedish ice classes
10:
2551:
528:in the Canadian Arctic.
29:
2404:Retrieved 2015-04-29.
1812:. Seaspan. March 16, 2023
1112:Retrieved 2011-11-21.
1068:Retrieved 2017-03-11.
1046:Retrieved 2017-03-11.
1025:Retrieved 2024-02-16.
860:United States Coast Guard
855:, was delivered in 2021.
770:Norwegian Polar Institute
661:Norwegian Polar Institute
337:in 2014, and the British
935:
561:The interim icebreakers
435:(delivered in 2020) and
344:in 2020. In addition, a
2201:Vessel Register for DNV
2171:Damen Marine Components
1873:Vessel Register for DNV
1840:Vessel Register for DNV
1806:"Multi-Purpose Vessels"
1540:Vessel Register for DNV
1507:Vessel Register for DNV
1454:Vessel Register for DNV
1355:Vessel Register for DNV
1322:Vessel Register for DNV
1132:Vessel Register for DNV
948:Hull strengthened to PC
893:Polar-class icebreakers
837:As of 2023, the only PC
2448:. The Canadian Press.
961:Bow strengthened to PC
868:Polar Security Cutters
664:
480:
390:have entered service,
341:Sir David Attenborough
331:in 2012, the American
314:
72:classification society
52:
844:Le Commandant Charcot
652:
554:4 with an additional
472:
306:
120:Polar Class notations
40:
2402:. Lloyd's Register.
1246:ASMAR TALCAHUANO 114
732:project also have PC
722:(built in 2018) and
584:Canadian Coast Guard
443:Lindblad Expeditions
420:Canadian Coast Guard
161:Sea Ice Nomenclature
131:Sea Ice Nomenclature
89:(Polar Code) by the
2317:. Aker Arctic. 2021
2315:Arctic Passion News
1784:Arctic Passion News
1736:Arctic Passion News
849:Compagnie du Ponant
728:(2019) serving the
659:is operated by the
415:Robert Hampton Gray
366:Royal Canadian Navy
1651:, Lloyd's Register
1062:2015-10-19 at the
1019:2012-06-20 at the
976:Det Norske Veritas
912:are designed to PC
665:
565:Captain Molly Kool
481:
350:5 Antarctic vessel
315:
53:
2426:. pp. 68–71.
2424:Marine Technology
2267:. 31 January 2019
694:plant modules to
408:Frédérick Rolette
271:Polar Class ships
243:
242:
78:developed by the
16:(Redirected from
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2511:
2509:
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2195:Kronprins Haakon
2189:
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2178:
2173:. 28 August 2021
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1810:Seaspan Shipyard
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1126:S. A. Agulhas II
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1089:. pp. 12–13
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794:Kronprins Haakon
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656:Kronprins Haakon
636:
629:
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605:Almirante IrĂzar
596:
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556:Lloyd's Register
553:
540:
507:
495:
428:
375:
349:
328:S. A. Agulhas II
324:
319:research vessels
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290:
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147:
146:
62:) refers to the
50:
44:S. A. Agulhas II
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1571:. 29 April 2021
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518:and 2021-built
505:
504:operates two PC
493:
483:The 2012-built
467:
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387:Margaret Brooke
376:5. As of 2023,
373:
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301:
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2491:External links
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2240:S&P Global
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2124:S&P Global
2101:
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2044:. 4 March 2015
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2017:Bureau Veritas
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874:Polar Sentinel
834:
831:
738:Bureau Veritas
736:3 rating from
646:
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599:Argentine Navy
579:Vincent Massey
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830:
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799:
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786:
782:in 2019, and
781:
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719:Boris Sokolov
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645:Polar Class 3
642:
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631:
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516:
512:, 2014-built
511:
510:bulk carriers
503:
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465:Polar Class 4
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459:Swan Hellenic
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362:
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360:
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18:Polar Class 5
2525:Shipbuilding
2476:. Retrieved
2466:
2454:. Retrieved
2442:
2432:
2423:
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2395:
2383:. Retrieved
2381:. 3 Aug 2023
2378:
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2347:
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2319:. Retrieved
2314:
2302:
2291:. Retrieved
2289:. 2021-08-03
2281:
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2020:. Retrieved
2012:
2006:
1999:
1987:. Retrieved
1979:
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1954:. Retrieved
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1289:the original
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1052:
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700:
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678:
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667:The first PC
666:
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489:Stena IceMAX
487:
482:
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446:
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430:
424:
414:
407:
401:William Hall
400:
393:
386:
380:Harry DeWolf
379:
363:
359:Chilean Navy
353:
340:
333:
326:
317:A number of
316:
308:
282:
274:
265:
261:
257:steel grades
249:
246:Requirements
173:Not defined
160:
150:Polar Class
139:
130:
123:
109:
103:
100:
84:
75:
59:
55:
54:
51:5 or higher.
42:
2530:Icebreakers
2042:Rolls-Royce
1669:24 February
1161:(14221929)"
526:Raglan Mine
457:(2022) for
451:(2021) and
441:(2021) for
394:Max Bernays
372:rated at PC
56:Polar Class
2519:Categories
2293:2021-09-17
2231:(9797060)"
2115:(9829241)"
2113:Xue Long 2
1618:(9734161)"
1420:(9895252)"
1385:(9895240)"
1383:SH Minerva
1248:(9843948)"
1165:ABS Record
986:References
907:CCGS
900:CCGS
881:Polar Star
853:North Pole
775:Xue Long 2
762:3 rating:
705:ice class
593:The new PC
448:SH Minerva
429:5 rating:
310:SH Minerva
253:scantlings
135:Icebreaker
115:Definition
97:Background
2379:USNI News
2009:(31415Y)"
1976:(31594T)"
1943:(28765T)"
1919:134457857
1816:March 27,
1790:March 27,
1191:"9798222"
909:Imnaryuaq
888:Polar Sea
792:in 2021.
772:in 2018,
753:Shell Oil
730:Yamal LNG
485:drillship
125:based on
64:ice class
27:Ice class
2450:Archived
2444:CTV News
2359:7 August
2321:7 August
2271:7 August
2245:7 August
2210:7 August
2197:(34021)"
2177:7 August
2151:7 August
2129:7 August
2013:BV Fleet
1980:BV Fleet
1947:BV Fleet
1924:7 August
1882:7 August
1869:(34383)"
1849:7 August
1836:(34382)"
1713:7 August
1691:7 August
1632:7 August
1597:11 April
1575:7 August
1549:7 August
1536:(39740)"
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1503:(32867)"
1463:7 August
1434:7 August
1399:7 August
1364:7 August
1351:(40923)"
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1318:(39066)"
1262:7 August
1227:7 August
1205:7 August
1159:Sikuliaq
1141:7 August
1128:(30528)"
1060:Archived
1017:Archived
902:Arpatuuq
788:for the
778:for the
768:for the
711:Yamalmax
508:4 rated
334:Sikuliaq
287:6 and PC
2535:Sea ice
2236:Sea-web
2120:Sea-web
2094:22 July
1623:Sea-web
1616:Polaris
1534:Arvik I
1501:Nunavik
1450:"30052"
1425:Sea-web
1418:SH Vega
1390:Sea-web
1253:Sea-web
1196:Sea-web
1174:16 June
1093:5 April
815:Nordica
809:Fennica
696:Sabetta
639:Seaspan
547:Polaris
521:Arvik I
515:Nunavik
476:Polaris
454:SH Vega
93:(IMO).
2265:Arctia
2229:Nuyina
2070:14 May
2048:14 May
1917:
1867:Pugnax
1569:Fednav
1298:25 May
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950:
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879:USCGC
872:USCGC
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129:(WMO)
49:
2508:(PDF)
2478:8 May
2456:8 May
2420:(PDF)
2385:4 Aug
2311:(PDF)
2089:(PDF)
2022:3 May
1989:3 May
1956:3 May
1915:S2CID
1834:Audax
1764:2 May
1742:2 May
1732:(PDF)
1485:(PDF)
1292:(PDF)
1281:(PDF)
936:Notes
801:'
674:Audax
577:CCGS
570:CCGS
563:CCGS
413:HMCS
406:HMCS
399:HMCS
392:HMCS
385:HMCS
378:HMCS
233:PC 7
222:PC 6
211:PC 5
200:PC 4
189:PC 3
178:PC 2
167:PC 1
70:by a
2480:2021
2458:2021
2387:2023
2361:2022
2323:2022
2273:2022
2247:2022
2212:2022
2179:2022
2153:2022
2131:2022
2096:2019
2072:2016
2050:2016
2024:2023
1991:2023
1958:2023
1926:2022
1884:2022
1851:2022
1818:2023
1792:2023
1766:2023
1744:2023
1715:2022
1693:2022
1671:2020
1634:2022
1599:2015
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1551:2022
1518:2022
1465:2022
1436:2022
1401:2022
1366:2022
1333:2022
1300:2019
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1229:2022
1207:2022
1176:2014
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1095:2023
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884:and
858:The
812:and
707:Arc7
677:and
622:The
611:The
603:ARA
534:Otso
411:and
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339:RRS
255:and
68:ship
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1907:doi
1877:DNV
1844:DNV
1544:DNV
1511:DNV
1458:DNV
1359:DNV
1326:DNV
1136:DNV
689:LNG
158:WMO
137:".
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