Surveys

NAVAREA IV mobile offshore drilling units positions at 271200Z oct: a. argos 27-10.4N 090-21.9W

Caribbean Sea · NAVAREA IV 975/21

What this record establishes

Archived notice · 2021-11-03 12:47Z

This notice comes from the historical archive. Its archived status does not establish when or how the reported situation ended.

Source and dates
NGA MSI broadcast-warn JSON (archive, frozen 2024-05) · SFH 271617Z OCT 21.. Issued 2021-10-27 16:22Z. First collected 2026-08-17 13:38Z; last seen in collection 2026-08-17 15:46Z. Collection dates record ingestion, not a new incident or a fresh field observation.
Location covered
Caribbean Sea. The parsed report position is 19.985, -82.643. It is a position in the source message, not a live location. Check the original wording for limits and qualifications.

Related notices and cancellation links

Current notices and reporting history in the Caribbean Sea →

issued
2021-10-27 16:22Z
status
Archived notice
authority
SFH 271617Z OCT 21.
NAVAREA
NAVAREA IV
issued by
SFH
sea
Caribbean Sea
position
19.985, -82.643
source
NGA MSI broadcast-warn JSON (archive, frozen 2024-05) · first seen 2026-08-17 13:38Z

Original warning text

1. NAVAREA IV MOBILE OFFSHORE DRILLING UNITS
   POSITIONS AT 271200Z OCT:
   A. ARGOS 27-10.4N 090-21.9W.
   B. BLACKFORD DOLPHIN 18-51.3N 093-31.4W.
   C. BLAKE 651 28-23.5N 089-27.2W.
   D. COATZACOALCOS 18-49.8N 091-50.5W.
   E. COSLHUNTER 18-46.0N 093-13.0W.
   F. DEEPWATER ASGARD 27-55.9N 090-12.0W.
   G. DEEPWATER CONQUEROR 26-17.8N 091-05.6W.
   H. DEEPWATER INVICTUS 10-49.5N 061-35.0W.
   I. DEEPWATER PONTUS 28-11.7N 089-10.7W.
   J. DISCOVERER INSPIRATION 27-41.5N 091-06.8W.
   K. ENSCO 8505 18-59.5N 093-15.9W.
   L. ENTERPRISE 205 28-35.0N 091-16.8W.
   M. ENTERPRISE 264 28-45.5N 090-56.0W.
   N. FRIDA I 18-53.6N 093-31.0W.
   O. GALAR 18-28.8N 093-27.5W.
   P. GERSEMI 18-29.3N 093-20.7W.
   Q. GRID 18-42.7N 093-22.5W.
   R. GSF TRANSOCEAN DEVELOPMENT DRILLER III
      11-28.3N 059-27.9W.
   S. GSP ATLAS 19-36.0N 090-58.1W.
   T. GSP ORIZONT 19-36.0N 090-58.0W.
   U. HELIX Q5000 27-40.1N 090-16.5W.
   V. HOLSTEIN SPAR 27-19.3N 090-32.1W.
   W. JOE DOUGLAS 19-02.5N 092-26.6W.
   X. LIZA DESTINY 08-00.0N 057-00.0W.
   Y. LIZA UNITY 08-00.6N 056-54.8W.
   Z. MAERSK DEVELOPER 07-25.5N 056-00.5W.
   AA. MAERSK DISCOVERER 07-27.8N 056-24.7W.
   AB. MAERSK VALIANT 07-50.2N 055-56.5W.
   AC. MODS 200 28-06.1N 090-12.1W.
   AD. NABORS 202 28-47.5N 089-03.4W.
   AE. NJORD 18-33.2N 092-52.2W.
   AF. NOBLE BOB DOUGLAS 08-03.2N 056-56.8W.
   AG. NOBLE DON TAYLOR 08-15.4N 057-00.5W.
   AH. NOBLE REGINA ALLEN 10-39.1N 060-37.4W.
   AI. NOBLE SAM CROFT 08-06.5N 056-56.5W.
   AJ. NOBLE TOM MADDEN 08-06.0N 056-57.0W.
   AK. OCEAN BLACKHAWK 27-26.3N 090-16.3W.
   AL. OCEAN BLACKHORNET 27-09.7N 090-17.8W.
   AM. OCEAN BLACKLION 28-26.3N 088-16.8W.
   AN. ODIN 18-18.8N 094-15.8W.
   AO. PACIFIC SHARAV 27-32.2N 090-10.0W.
   AP. PAPALOAPAN 18-26.7N 094-08.2W.
   AQ. RALPH COFFMAN 10-40.5N 061-38.9W.
   AR. ROWAN EXL II 19-43.5N 092-18.0W.
   AS. ROWAN RELENTLESS 28-57.2N 088-15.0W.
   AT. SEADRILL WEST VELA 27-08.6N 090-16.1W.
   AU. SEVAN LOUISIANA 28-52.0N 090-09.1W.
   AV. SS 198 28-35.1N 091-15.3W.
   AW. SS 266 28-21.4N 091-05.3W.
   AX. STENA CARRON 07-52.4N 056-36.9W.
   AY. STENA DRILLMAX 08-04.4N 056-13.2W.
   AZ. STENA ICEMAX 18-58.0N 094-02.3W.
   AAA. WEST COURAGEOUS 19-33.8N 092-16.2W.
   AAB. WEST INTREPID 19-35.4N 092-13.2W.
   AAC. WEST NEPTUNE 27-41.5N 091-06.8W.
   AAD. WFD 250 29-07.8N 094-32.8W.
   AAE. WFD 300 28-13.7N 092-31.8W.
   AAF. WFD 350 28-45.7N 091-41.8W.
2. TO REPORT A MOBILE OFFSHORE DRILLING UNIT AS
   PER IMO RESOLUTION A.1023(26), PARAGRAPH 11.5.1,
   CONTACT NAVSAFETY@NGA.MIL SUBJ: MODU REPORT.
3. CANCEL NAVAREA IV 950/21.

Reading this warning

NAVAREA
One of the 21 ocean areas of the World-Wide Navigational Warning Service, each with a coordinator that broadcasts long-range warnings.
Drilling rig / MODU
A mobile offshore drilling unit — jack-up, semi-submersible or drillship — has moved into position, with anchors and a safety zone around it.
Date-time group (DTG)
A compact UTC timestamp — day, hour and minute followed by Z — such as 201500Z for the 20th at 15:00 UTC.
Position (degrees and minutes)
How warnings write positions: degrees, a hyphen, then minutes, with N/S and E/W — 49-40.8N 003-43.8W.
Cancellation reference
A line that cancels an earlier warning by its number, such as CANCEL HYDROLANT 1085/12.

All warning terms →

Collected reports in this area · survey operations

101 within 180 nm since 2021 · 5 in the last 12 months · 1 listed in force now

21
25
26

Counts include repeat notices about the same situation. NGA archive coverage ends 2024-05; live collection began 2026-08-17. The period between them is incomplete. An empty year is not evidence that no hazards occurred.

Month of issue in the collected archive

J
F
M
A
M
J
J
A
S
O
N
D

All available years combined. Uneven collection and repeat bulletins affect these counts; this chart does not measure the seasonality or probability of incidents.

Nearby notices listed in force · within 120 nm

Worldwide in the collected sources

50 survey operations listed in force · see all

Record snapshot 2026-09-25 17:28Z; source collection times vary.

Surveys

Hydrographic and scientific survey vessels, often towing long arrays. All current survey operations →

Not for navigation. This is a re-rendering of an official navigational warning for awareness; mariners must use official NAVAREA broadcasts and their national MSI service.