Surveys

NAVAREA IV mobile offshore drilling units positions 271405Z sep: a. argos 27-10.4N 090-21.9W

Gulf of Mexico · NAVAREA IV 1121/23

What this record establishes

Archived notice · 2023-10-18 13:34Z

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 271501Z SEP 23.. Issued 2023-09-27 18:09Z. 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 22.759, -83.896. 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
2023-09-27 18:09Z
status
Archived notice
authority
SFH 0/23 271501Z SEP 23.
NAVAREA
NAVAREA IV
issued by
SFH
sea
Gulf of Mexico
position
22.759, -83.896
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 271405Z SEP:
   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. DEEPWATER ASGARD 28-14.9N 088-52.4W.
   F. DEEPWATER ATLAS 26-54.1N 091-35.5W.
   G. DEEPWATER CONQUEROR 28-23.3N 088-11.0W.
   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. (NEW POSITION) DEEPWATER PROTEUS
      28-28.3N 087-56.6W.
   L. DEEPWATER THALASSA 26-09.5N 094-47.3W.
   M. DEEPWATER TITAN 28-01.4N 089-18.5W.
   N. (NEW POSITION) 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. (NEW POSITION) 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. HELIX Q4000 27-16.0N 090-48.3W.
   Y. HELIX Q5000 28-23.2N 089-13.1W.
   Z. HOLSTEIN SPAR 27-19.6N 090-31.0W.
   AA. JOE DOUGLAS 10-22.0N 060-36.2W.
   AB. LIZA DESTINY 08-00.6N 056-59.5W.
   AC. LIZA UNITY 08-00.5N 056-54.8W.
   AD. MAD DOG 27-11.3N 090-16.4W.
   AE. MSV OCEAN EVOLUTION 28-00.7N 089-10.3W.
   AF. NABORS MODS 140 28-12.4N 088-46.4W.
   AG. NABORS MODS 200 28-06.2N 090-12.1W.
   AH. NABORS MODS 400 26-55.7N 090-31.4W.
   AI. NOBLE BOB DOUGLAS 08-14.7N 057-00.1W.
   AJ. NOBLE DISCOVERER 07-22.9N 055-47.2W.
   AK. (NEW POSITION) NOBLE DON TAYLOR
       08-04.5N 056-58.5W.
   AL. NOBLE FAYE KOZACK 26-11.4N 092-07.9W.
   AM. NOBLE GLOBETROTTER I 20-11.6N 094-09.5W.
   AN. NOBLE GLOBETROTTER II 26-17.5N 094-24.2W.
   AO. NOBLE SAM CROFT 08-15.2N 056-56.9W.
   AP. (NEW POSITION) NOBLE TOM MADDEN
       07-57.4N 056-41.0W.
   AQ. NOBLE VALIANT 26-02.1N 091-59.4W.
   AR. NOBLE VOYAGER 09-20.6N 076-50.1W.
   AS. (NEW POSITION) OCEAN BLACKHORNET
       28-12.8N 088-28.9W.
   AT. OCEAN BLACKLION 27-08.6N 090-19.3W.
   AU. ODIN 18-18.3N 094-05.3W.
   AV. OLYMPUS N88 28-09.6N 089-12.8W.
   AW. PAPALOAPAN 19-29.0N 092-01.6W.
   AX. PROSPERITY 08-11.5N 057-00.0W.
   AY. RALPH COFFMAN 18-20.4N 093-53.6W.
   AZ. ROWAN EXL II 29-03.3N 091-27.7W.
   AAA. ROWAN RELENTLESS 26-12.4N 091-27.5W.
   AAB. SAIPEM SANTORINI 28-12.3N 088-46.5W.
   AAC. SEVAN LOUISIANA 27-53.8N 089-00.9W.
   AAD. (NEW POSITION) STENA CARRON
        07-44.0N 056-18.0W.
   AAE. (NEW POSITION) STENA DRILLMAX
        08-13.5N 056-58.8W.
   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 110 10-10.5N 061-45.4W.
   AAK. WELL SERVICES RIG 50 10-40.6N 061-38.7W.
   AAL. WEST AURIGA 27-13.7N 090-01.9W.
   AAM. WEST COURAGEOUS 19-35.1N 092-13.7W.
   AAN. WEST DEFENDER 18-40.4N 092-52.4W.
   AAO. WEST INTREPID 19-36.5N 092-15.5W.
   AAP. (NEW POSITION) WEST NEPTUNE
        28-25.4N 089-04.2W.
   AAQ. WEST VELA 27-01.5N 091-00.4W.
   AAR. (NEW POSITION) 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 1082/23.

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

144 within 180 nm since 2002 · 5 in the last 12 months · 1 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

Worldwide in the collected sources

56 survey operations listed in force · see all

Record snapshot 2026-10-01 13:59Z; 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.