| 1 | 25,165 d | Other | Navigational warnings broadcast by nga are normally divided into categories, hydrolants and hydropacs (1),… | SPECIAL 1/48 1948-05-27 → 2017-04-20 |
| 2 | 8,947 d | Other | Mariners are advised to use caution when sailing near the coast of liberia | SPECIAL 92/92 1992-12-03 → 2017-06-02 |
| 3 | 8,872 d | Other | Due to unsettled relations between the united states government and the government of libya, U.S | SPECIAL 81/90 1990-08-31 → 2014-12-16 |
| 4 | 8,872 d | Other | Mariners are advised to exercise caution within the territorial waters claimed by morocco U.S | SPECIAL 82/90 1990-08-31 → 2014-12-16 |
| 5 | 7,830 d | Other | Effective 4 october 1977 guyana intends to enforce its 200-MILE fishery zone | NAVAREA IV 2524/77 1977-10-03 → 1999-03-13 |
| 6 | 7,437 d | Other | The department of state advises in an effort to control the flow of contraband, effective november 1, the… | NAVAREA IV 2528/78 1978-10-31 → 1999-03-13 |
| 7 | 6,475 d | Other | Mariners are cautioned that the government of guinea is particularly sensitive to unauthorized fishing… | HYDROLANT 1893/81 1981-12-04 → 1999-08-27 |
| 8 | 6,003 d | Other | Sub-surface accoustic current meters array (depth 100 meter) established in 21-38N | NAVAREA IV 2929/82 1982-10-04 → 1999-03-13 |
| 9 | 5,922 d | Other | Mariners are strongly advised not to use any ports in sierra leone except for the port of freetown, which is… | SPECIAL 119/01 2001-03-16 → 2017-06-02 |
| 10 | 5,633 d | Other | Special warnings, primarily intended to announce official government proclamations affecting shipping, are… | SPECIAL 0/83 1983-12-31 → 1999-06-04 |
| 11 | 5,033 d | Other | Mariners calling on pakistan are advised that levels of sectarian and factional violence remain high | SPECIAL 116/01 2001-03-05 → 2014-12-16 |
| 12 | 5,029 d | Other | Department of state warns U.S The U.S | SPECIAL 118/01 2001-03-09 → 2014-12-16 |
| 13 | 4,423 d | Other | As of early 2005, the united states government has received unconfirmed information that terrorists may… | SPECIAL 122/05 2005-03-11 → 2017-04-20 |
| 14 | 3,440 d | Other | On 12 oct 2000, several U.S The Level of Risk For Foreigners In Yemen Remains High | SPECIAL 113/00 2000-10-13 → 2010-03-16 |
| 15 | 3,225 d | Other | The state department advises that the risk of acts of international terrorism in europe and the middle east… | HYDROPAC 1191/90 1990-10-27 → 1999-08-27 |
| 16 | 2,183 d | Other | Mariners calling on pakistan are advised that levels of sectarian and factional violence remain high | SPECIAL 102/95 1995-03-14 → 2001-03-05 |
| 17 | 1,909 d | Other | Mariners are advised to avoid the vicinity of the hanish islands (jazirat al hanish al kabir and jazirat al… Red Sea | SPECIAL 105/95 1995-12-08 → 2001-02-28 |
| 18 | 1,582 d | Other | US Coast Guard District 17 search and rescue phone in Alaska is inoperative. Contact Sector Anchorage 907 428 4100 or Pacific Area Command 510 437 3701. North Pacific · Bering Sea Alaska | HYDROPAC 1035/22 2022-04-14 → 2026-08-14 |
| 19 | 1,511 d | Other | Mine marked by buoy in 45-25.8N 012-40.0E Adriatic Sea | HYDROLANT 1960/96 1996-12-16 → 2001-02-05 |
| 20 | 1,381 d | Other | Dangerous werck in 12-03.08N 109-22.00E South China Sea · Vietnam · South China Sea | HYDROPAC 3528/14 2014-11-26 → 2018-09-07 |
| 21 | 1,372 d | Other | Dangerous submerged rock, least depth 9.4 meters, in 12-25.40N 061-27.83W Eastern Caribbean Sea · Grenadines · Caribbean Sea | NAVAREA IV 42/17 2017-01-20 → 2020-10-23 |
| 22 | 1,351 d | Other | Dangerous submerged rocks in: a. 12-23.42N 061-29.40W, least depth 5.2 meters Eastern Caribbean Sea · Caribbean Sea | NAVAREA IV 108/17 2017-02-10 → 2020-10-23 |
| 23 | 1,337 d | Other | NGA maritime safety websites have technical difficulties; users can access Digital Nautical Chart patches and ESync through alternative websites. Maritime Safety Websites | HYDROLANT 3226/22 2022-12-16 → 2026-08-14 |
| 24 | 1,337 d | Other | Technical difficulties affect maritime safety websites; access alternatives and contact info are provided, and HYDROPAC 3372/22 is canceled. Maritime Safety Websites | HYDROPAC 3606/22 2022-12-16 → 2026-08-14 |
| 25 | 1,319 d | Other | Uncharted islets reported vicinity 79-20.45N 015-50.39W Greenland Sea | HYDROLANT 2937/00 2000-08-23 → 2004-04-03 |
| 26 | 1,304 d | Other | Abandoned fishing gear is located in the Bay of Biscay, France, near 46-16.00N 002-18.00W. Bay of Biscay · France · Bay of Biscay | HYDROLANT 142/23 2023-01-18 → 2026-08-14 |
| 27 | 1,275 d | Other | A gas leak, marked by a flashing white buoy, is at 25-38.90N 054-27.80E in the Persian Gulf off Iran; HYDROPAC 526/23 is cancelled. Persian Gulf · Iran · Persian Gulf | HYDROPAC 538/23 2023-02-16 → 2026-08-14 |
| 28 | 1,273 d | Other | Coast guard precautionary transit notification vicinity of fukushima japan Western North Pacific · Japan-east Coast · U.S · North Pacific Ocean | HYDROPAC 1079/12 2012-04-16 → 2015-10-11 |
| 29 | 1,272 d | Other | Coast guard precautionary transit notification vicinity of fukushima japan Western North Pacific · Japan-east Coast · U.S · North Pacific Ocean | NAVAREA XII 110/12 2012-04-16 → 2015-10-11 |
| 30 | 1,204 d | Other | Navigation warning 227/23 for eastern North Pacific near California is canceled; operations completed. Eastern North Pacific · California | NAVAREA XII 248/23 2023-04-27 → 2026-08-14 |
| 31 | 1,203 d | Other | A lost anchor is reported at 25-01.57N 053-03.22E in the Persian Gulf, U.A.E. Persian Gulf · U.A.E · Persian Gulf | HYDROPAC 1419/23 2023-04-29 → 2026-08-14 |
| 32 | 1,180 d | Other | B. 07-16.80S 012-03.21E Eastern South Atlantic · Angola · South Atlantic Ocean | HYDROLANT 2758/13 2013-11-04 → 2017-01-27 |
| 33 | 1,173 d | Other | Shetland Islands Eastern North Atlantic · North Atlantic Ocean | HYDROLANT 2849/13 2013-11-11 → 2017-01-27 |
| 34 | 1,171 d | Other | Nga chart 91020 (5TH ed) South China Sea | HYDROPAC 1345/08 2008-07-16 → 2011-10-01 |
| 35 | 1,171 d | Other | Ilet Cabrits light at 14-23.52N 060-52.07W is off station in eastern Caribbean Sea near Martinique. Eastern Caribbean Sea · Martinique · Caribbean Sea | NAVAREA IV 594/23 2023-05-31 → 2026-08-14 |
| 36 | 1,105 d | Other | A fishing vessel reported sunk in the vicinity of 09-39.49N 079-26.97E in Palk Strait, Sri Lanka. Palk Strait · Sri Lanka · Bay of Bengal | HYDROPAC 2526/23 2023-08-05 → 2026-08-14 |
| 37 | 1,103 d | Other | Part 2 of 2. refer to 245/02 for part 1. e. documentation: vessel documentation must conform to the… | HYDROLANT 246/02 2002-02-01 → 2005-02-08 |
| 38 | 1,103 d | Other | Part 2 of 2. refer to 205/02 for part 1. e. documentation: vessel documentation must conform to the… | HYDROPAC 206/02 2002-02-01 → 2005-02-08 |
| 39 | 1,068 d | Other | Underwater seamount, least depth 925 meters, reported in 78-36.91N 158-21.35W Arctic Ocean | HYDROARC 3/07 2007-09-04 → 2010-08-08 |
| 40 | 1,049 d | Other | Some measure of danger from mines continues to exist from mines which have been sunk but not destroyed | HYDROPAC 901/97 1997-11-26 → 2000-10-11 |
| 41 | 1,043 d | Other | Hydrographic warnings 242/23, 243/23, and this message are canceled because they were issued in error. | HYDROARC 245/23 2023-10-06 → 2026-08-14 |
| 42 | 1,023 d | Other | Pith reef light 18-13.2S 147-01.4E range increased to 15 miles Coral Sea · Australia-northeast Coast · Coral Sea | HYDROPAC 1256/15 2015-04-15 → 2018-02-01 |
| 43 | 1,023 d | Other | A submerged orange object is reported in the Bay of Biscay near 47-02N 003-17W. Bay of Biscay · France · Bay of Biscay | HYDROLANT 2443/23 2023-10-26 → 2026-08-14 |
| 44 | 941 d | Other | MRCC La Reunion at 21-06.00S 055-36.00E is unable to receive medium and high frequency transmissions; contact by phone or email. Western Indian Ocean · Reunion · Indian Ocean | HYDROPAC 188/24 2024-01-16 → 2026-08-14 |
| 45 | 939 d | Other | Subsurface moorings established within 80 meters of surface in: a. 56-33.6N 052-39.5W Labrador Sea | NAVAREA IV 623/96 1996-08-21 → 1999-03-19 |
| 46 | 931 d | Other | Shetland Islands North Sea | HYDROLANT 2118/12 2012-09-12 → 2015-04-02 |
| 47 | 920 d | Other | Manifold established in 57-21.8N 000-49.3E North Sea | HYDROLANT 1166/00 2000-04-03 → 2002-10-11 |
| 48 | 904 d | Other | Aids to navigation for the approach to st john's harbor (17-07.6N 061-51.7W) are unreliable Eastern Caribbean Sea · Antigua and Barbuda · Caribbean Sea | NAVAREA IV 977/21 2021-10-28 → 2024-04-19 |
| 49 | 893 d | Other | F/V sunk in 31-08.5N 081-17.7W at 280823Z sep North Atlantic Ocean | NAVAREA IV 729/96 1996-09-30 → 1999-03-13 |
| 50 | 883 d | Other | Cancel HYDROLANT 2326/13 Southern North Sea · North Sea | HYDROLANT 2397/13 2013-09-27 → 2016-02-28 |
| 51 | 860 d | Other | DNC03 (28ED) label incorrect Indian Ocean | HYDROPAC 89/21 2021-01-08 → 2023-05-19 |
| 52 | 858 d | Other | A 32-foot blue-hulled vessel is partially submerged at 12-26.94N 068-09.73W near Bonaire, Caribbean Sea, as of 081024Z April. Caribbean Sea · Bonaire · Caribbean Sea | NAVAREA IV 403/24 2024-04-08 → 2026-08-14 |
| 53 | 856 d | Other | Citizens of the risks of traveling to sudan, urges U.S The Department of State Warns U.S | SPECIAL 127/14 2014-12-16 → 2017-04-20 |
| 54 | 854 d | Other | A sand spit marked by a daymark near Baillie Island, Canada, has shifted along a trackline between 70-30.56N 128-20.88W and 70-30.10N 128-19.97W. Beaufort Sea · Canada · Beaufort Sea | HYDROARC 54/24 2024-04-12 → 2026-08-14 |
| 55 | 851 d | Other | Northern South China Sea South China Sea | HYDROPAC 2493/13 2013-08-21 → 2015-12-20 |
| 56 | 849 d | Other | Dangerous submerged rocks in: a. 18-16.5N 063-08.2W, least depth 6.9 meters Eastern Caribbean Sea · Anguilla · Caribbean Sea | NAVAREA IV 123/17 2017-02-15 → 2019-06-14 |
| 57 | 849 d | Other | Dangerous submerged rocks in: a. 18-17.1N 063-15.2W, least depth 2.3 meters Eastern Caribbean Sea · Anguilla · Caribbean Sea | NAVAREA IV 124/17 2017-02-15 → 2019-06-14 |
| 58 | 844 d | Other | Fishing gear, marked by buoys and abandoned, is in the Irish Sea off Wales at 53-30.10N 004-12.70W. Irish Sea · Wales · Irish Sea and St. George's Channel | HYDROLANT 852/24 2024-04-22 → 2026-08-14 |
| 59 | 844 d | Other | Two vessels collide in the eastern Mediterranean Sea near Sicily at 36-27N 015-15E on April 22 at 0930 UTC; nearby vessels are asked to assist. Eastern Mediterranean Sea · Sicily · Mediterranean Sea - Eastern Basin | HYDROLANT 853/24 2024-04-22 → 2026-08-14 |
| 60 | 842 d | Other | All services unreliable at U.S. Coast Guard remote communication facilities at Boston, Charleston, Chesapeake, Miami, New Orleans, and San Juan. North Atlantic Ocean | NAVAREA IV 460/24 2024-04-23 → 2026-08-14 |
| 61 | 842 d | Other | A United States Coast Guard communication facility in Guam at 13-28.60N 144-50.10E has all services unreliable. Western North Pacific · Guam · North Pacific Ocean | HYDROPAC 1335/24 2024-04-23 → 2026-08-14 |
| 62 | 841 d | Other | Nga chart 15863 (0 ed) Arctic · Bellot Strait · The Northwestern Passages | HYDROARC 45/10 2010-07-31 → 2012-11-18 |
| 63 | 836 d | Other | Partially submerged reef vicinity 09-02.7N 108-17.3E South China Sea | HYDROPAC 835/99 1999-08-24 → 2001-12-07 |
| 64 | 835 d | Other | The Port of Baltimore is open with restrictions due to a marine casualty until further notice. Western North Atlantic · Maryland · North Atlantic Ocean | NAVAREA IV 490/24 2024-05-01 → 2026-08-14 |
| 65 | 830 d | Other | At no time shall any ship or other craft, other than public ships of the united states, be navigated into… | NAVAREA IV 108/03 2003-03-21 → 2005-06-29 |
| 66 | 830 d | Other | At no time shall any ship or other craft, other than public ships of the united states, be navigated into… | HYDROLANT 604/03 2003-03-21 → 2005-06-29 |
| 67 | 828 d | Other | All communication services are unreliable at Astoria, Cambria, Honolulu, and Kodiak; restored at Point Reyes; warning 273/24 is cancelled. Eastern North Pacific · North Pacific Ocean | NAVAREA XII 316/24 2024-05-08 → 2026-08-14 |
| 68 | 823 d | Other | Mexican chart sm 722.3 Gulf of Mexico | NAVAREA IV 385/05 2005-11-21 → 2008-02-23 |
| 69 | 804 d | Other | Rcc new zealand inmarsat-c unusable 040519Z jan until further notice Western South Pacific · New Zealand | HYDROPAC 50/20 2020-01-04 → 2022-03-18 |
| 70 | 793 d | Other | Part 2 of 2. refer to 230/97 for part 1. e. documentation: vessel documentation must conform to the… | NAVAREA IV 231/97 1997-06-24 → 1999-08-27 |
| 71 | 793 d | Other | Part 2 of 2. refer to 916/97 for part 1. e. documentation: vessel documentation must conform to the… | HYDROLANT 917/97 1997-06-24 → 1999-08-27 |
| 72 | 793 d | Other | Part 2 of 2. refer to 210/97 for part 1. e. documentation: vessel documentation must conform to the… | NAVAREA XII 211/97 1997-06-24 → 1999-08-27 |
| 73 | 793 d | Other | Part 2 of 2. refer to 506/97 for part 1. e. documentation: vessel documentation must conform to the… | HYDROPAC 507/97 1997-06-24 → 1999-08-27 |
| 74 | 781 d | Other | Due to safety measures to combat COVID-19, all moroccan ports will be closed to pleasure craft and passenger… Eastern North Atlantic · Strait of Gibraltar · Western Mediterranean Sea · Morocco | HYDROLANT 991/20 2020-03-16 → 2022-05-06 |
| 75 | 777 d | Other | Pipelaying operations in progress until further notice by M/V dlb abouzar 1200 along trackline joining… Persian Gulf | HYDROPAC 207/03 2003-02-04 → 2005-03-23 |
| 76 | 772 d | Other | Mariners are advised that navaids in papua new guinea waters are unreliable until further notice due to… | HYDROPAC 17/06 2006-01-04 → 2008-02-16 |
| 77 | 769 d | Other | Partially submerged red mooring buoy with approximately 200 feet of line trailing away reported in 28-26N… Gulf of Mexico | NAVAREA IV 64/97 1997-02-01 → 1999-03-13 |
| 78 | 766 d | Other | With effect from 030001Z jun 97, the deep water route (dwr) via off brown ridge tss (53-00N 003-20E) is a… North Sea | HYDROLANT 813/97 1997-06-02 → 1999-07-09 |
| 79 | 751 d | Other | Pipelaying operations in progress until further notice along trackline between 07-10.0N 103-05.8E and… Gulf of Thailand | HYDROPAC 2454/06 2006-12-14 → 2009-01-04 |
| 80 | 738 d | Other | Pipe trenching operations in progress until further notice by M/V plb 648 and M/V ccc pioneer in area… | HYDROPAC 751/07 2007-04-24 → 2009-05-02 |
| 81 | 733 d | Other | Pipelaying operations in progress until further notice by M/V castoro sei along trackline between 25-56.6N… Persian Gulf | HYDROPAC 209/06 2006-02-06 → 2008-02-10 |
| 82 | 733 d | Other | Large structure established in 29-07.5N 124-56.6E Eastern China Sea | HYDROPAC 524/06 2006-03-27 → 2008-03-30 |
| 83 | 732 d | Other | Pipelaying operations in progress until further notice by barge castoro due with support vessels in area… Persian Gulf | HYDROPAC 214/06 2006-02-07 → 2008-02-10 |
| 84 | 730 d | Other | Due to safety measures to combat COVID-19, all tunisian ports will be closed to pleasure craft, fishing… Eastern Mediterranean Sea · Strait of Sicily · Tunisia | HYDROLANT 1028/20 2020-03-18 → 2022-03-18 |
| 85 | 729 d | Other | Pleasure craft are prohibited from stopping over or mooring in the internal waters and territorial waters of… Western South Pacific · Coral Sea · New Caledonia | HYDROPAC 914/20 2020-03-18 → 2022-03-18 |
| 86 | 724 d | Other | Oil field delta established in 18-36.00N 071-01.63E, marked by buoy in 18-36.00N 071-02.50E Arabian Sea | HYDROPAC 257/06 2006-02-15 → 2008-02-10 |
| 87 | 713 d | Other | Dangerous submerged rock, depth 9.3 meters, in 24-22.0N 118-28.1E South China Sea | HYDROPAC 1698/06 2006-08-30 → 2008-08-13 |
| 88 | 710 d | Other | Effective immediately, all vessels to which the vts zone regulations are applicable who intend entering the… To Entering Canadian Waters | HYDROPAC 1647/01 2001-10-12 → 2003-09-23 |
| 89 | 708 d | Other | Pipelaying operations in progress until further notice by barge petrojet along trackline between 28-07.32N… Gulf of Suez | HYDROPAC 351/06 2006-03-03 → 2008-02-10 |
| 90 | 707 d | Other | Effective immediately, all vessels to which the vts zone regulations are applicable who intend entering the… To Entering Canadian Waters | NAVAREA XII 298/01 2001-10-12 → 2003-09-20 |
| 91 | 702 d | Other | Morocco has announced that all maritime activities are prohibited in area bound by 33-33.3N 007-45.0W,… North Atlantic Ocean | HYDROLANT 1371/98 1998-07-14 → 2000-06-16 |
| 92 | 696 d | Other | Due to the international health situation, all pleasure vessels are prohibited entry to french polynesia,… South Pacific · French Polynesia | HYDROPAC 1247/20 2020-04-20 → 2022-03-18 |
| 93 | 689 d | Other | Well, 6 meters above surface, marked by light qfl w 3 miles, in 21-28.9S 114-00.5E Indian Ocean | HYDROPAC 496/06 2006-03-23 → 2008-02-10 |
| 94 | 674 d | Other | Platform reported in 07-25N 103-26E South China Sea · Gulf of Thailand · Gulf of Thailand | HYDROPAC 996/18 2018-03-14 → 2020-01-17 |
| 95 | 673 d | Other | North ronaldsay light 59-23N 002-23W at reduced intensity North Sea | HYDROLANT 715/97 1997-05-08 → 1999-03-13 |
| 96 | 668 d | Other | U.S Arabian Sea · Gulf of Oman · Persian Gulf | HYDROPAC 1478/20 2020-05-18 → 2022-03-18 |
| 97 | 667 d | Other | In response to all mariners that have helped coalition maritime forces in the global war on terror and to… | HYDROPAC 694/04 2004-04-19 → 2006-02-15 |
| 98 | 658 d | Other | Dangerous submerged rocks, least depth 10 meters, in 35-16.13S 055-06.20W South Atlantic Ocean | HYDROLANT 529/97 1997-04-03 → 1999-01-22 |
| 99 | 653 d | Other | Least depth 4.6 meters reported in area bound by 60-12.3S 045-42.2W, 60-12.3S 045-41.4W, 60-43.4S 045-41.4W,… Scotia Sea · Weddell Sea · Antarctica · Southern Ocean | HYDROLANT 417/22 2022-02-11 → 2023-11-26 |
| 100 | 652 d | Other | Hon chut light 11-47.0N 109-13.3E range increased to 16 miles South China Sea · Vietnam · South China Sea | HYDROPAC 1156/16 2016-04-20 → 2018-02-01 |