Surveys

NAVAREA IV mobile offshore drilling units positions at 181300Z oct: a. argos 27-10.4N 090-21.9W

Gulf of Mexico · NAVAREA IV 1204/23

What this record establishes

Archived notice · 2023-11-01 21:47Z

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 0/23 181325Z OCT 23.. Issued 2023-10-18 13:34Z. 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
Gulf of Mexico. The parsed report position is 23.987, -84.413. 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 Gulf of Mexico →

issued
2023-10-18 13:34Z
status
Archived notice
authority
SFH 0/23 181325Z OCT 23.
NAVAREA
NAVAREA IV
issued by
SFH
sea
Gulf of Mexico
position
23.987, -84.413
vessel
MSV OCEAN EVOLUTION · 36 messages
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 181300Z OCT:
   A. ARGOS 27-10.4N 090-21.9W.
   B. BLAKE 1007 27-22.0N 094-28.1W.
   C. BORR RAN 19-02.6N 092-26.6W.
   D. COATZACOALCOS 19-28.9N 091-57.0W.
   E. (NEW POSITION) DEEPWATER ASGARD
      27-29.8N 090-33.5W.
   F. DEEPWATER ATLAS 26-54.1N 091-35.5W.
   G. (NEW POSITION) DEEPWATER CONQUEROR
      26-17.9N 091-05.6W.
   H. DEEPWATER INVICTUS 28-50.4N 090-07.4W.
   I. DEEPWATER PONTUS 28-01.7N 089-09.7W.
   J. DEEPWATER POSEIDON 26-35.6N 091-18.4W.
   K. DEEPWATER PROTEUS 28-28.3N 087-56.6W.
   L. (NEW POSITION) DEEPWATER THALASSA
      26-14.6N 094-44.6W.
   M. DEEPWATER TITAN 28-01.4N 089-18.5W.
   N. DEVELOPMENT DRILLER III 12-26.5N 070-06.5W.
   O. DISCOVERER INSPIRATION 28-51.1N 090-05.8W.
   P. ENTERPRISE 264 29-11.5N 088-57.0W.
   Q. ENTERPRISE 351 28-15.3N 091-26.0W.
   R. FRIDA I 23-36.3N 091-26.4W.
   S. GALAR 18-30.5N 093-26.5W.
   T. GERSEMI 18-29.1N 093-21.6W.
   U. GRID 18-44.8N 093-07.4W.
   V. GSP ORIZONT 19-36.0N 090-58.0W.
   W. H&P RIG 205 26-06.6N 094-53.1W.
   X. (NEW POSITION) HELIX Q4000
      27-24.5N 090-19.0W.
   Y. HOLSTEIN SPAR 27-19.6N 090-31.0W.
   Z. JOE DOUGLAS 10-22.0N 060-36.2W.
   AA. LIZA DESTINY 08-00.6N 056-59.5W.
   AB. LIZA UNITY 08-00.5N 056-54.8W.
   AC. MAD DOG 27-11.3N 090-16.4W.
   AD. MSV OCEAN EVOLUTION 28-00.7N 089-10.3W.
   AE. NABORS MODS 140 28-12.4N 088-46.4W.
   AF. NABORS MODS 200 28-06.2N 090-12.1W.
   AG. NABORS MODS 400 26-55.7N 090-31.4W.
   AH. (NEW POSITION) NOBLE BOB DOUGLAS
       08-15.3N 057-00.4W.
   AI. NOBLE DISCOVERER 07-22.9N 055-47.2W.
   AJ. NOBLE DON TAYLOR 08-04.5N 056-58.5W.
   AK. NOBLE FAYE KOZACK 26-11.4N 092-07.9W.
   AL. NOBLE GLOBETROTTER I 20-11.6N 094-09.5W.
   AM. NOBLE GLOBETROTTER II 26-17.5N 094-24.2W.
   AN. (NEW POSITION) NOBLE SAM CROFT
       08-14.8N 057-00.2W.
   AO. (NEW RIG) NOBLE STANLEY LAFOSSE
       28-41.4N 088-11.3W.
   AP. NOBLE TOM MADDEN 07-57.4N 056-41.0W.
   AQ. NOBLE VALIANT 26-02.1N 091-59.4W.
   AR. OCEAN BLACKHORNET 28-12.8N 088-28.9W.
   AS. (NEW POSITION) OCEAN BLACKLION
       27-07.9N 090-20.3W.
   AT. ODIN 18-18.3N 094-05.3W.
   AU. OLYMPUS N88 28-09.6N 089-12.8W.
   AV. PAPALOAPAN 19-29.0N 092-01.6W.
   AW. PROSPERITY 08-11.5N 057-00.0W.
   AX. RALPH COFFMAN 18-20.4N 093-53.6W.
   AY. ROWAN EXL II 29-03.3N 091-27.7W.
   AZ. ROWAN RELENTLESS 26-12.4N 091-27.5W.
   AAA. SAIPEM SANTORINI 28-12.3N 088-46.5W.
   AAB. (NEW POSITION) SEVAN LOUISIANA
        29-05.0N 088-05.8W.
   AAC. STENA CARRON 07-44.0N 056-18.0W.
   AAD. (NEW POSITION) STENA DRILLMAX
        07-55.8N 056-42.4W.
   AAE. (NEW RIG) STENA ICEMAX 28-10.0N 088-28.7W.
   AAF. THUNDERHORSE PDQ 28-11.4N 088-29.7W.
   AAG. VALARIS 249 10-14.8N 060-30.9W.
   AAH. VALARIS DPS-5 28-52.1N 088-02.5W.
   AAI. VALARIS DS-16 27-24.5N 090-13.1W.
   AAJ. WELL SERVICES RIG 50 10-40.6N 061-38.7W.
   AAK. (NEW POSITION) WEST AURIGA 27-13.4N 090-00.9W.
   AAL. WEST COURAGEOUS 19-35.1N 092-13.7W.
   AAM. WEST DEFENDER 18-40.4N 092-52.4W.
   AAN. WEST INTREPID 19-36.5N 092-15.5W.
   AAO. WEST NEPTUNE 28-25.4N 089-04.2W.
   AAP. (NEW POSITION) WEST VELA 27-01.5N 091-00.4W.
   AAQ. WFD 250 28-54.9N 090-20.8W.
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 1121/23.

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

108 within 180 nm since 2002 · 2 in the last 12 months · 0 listed in force now

02
05
10
15
20
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

No other collected notice is currently listed in force within this radius. This does not establish safe conditions.

Worldwide in the collected sources

55 survey operations listed in force · see all

Record snapshot 2026-10-01 07:11Z; 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.