Surveys

NAVAREA IV mobile offshore drilling units positions at 261440Z jul: a. argos 27-10.4N 090-21.9W

Gulf of Mexico · NAVAREA IV 842/23

What this record establishes

Archived notice · 2023-08-02 15:47Z

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 261454Z JUL 23.. Issued 2023-07-26 14:57Z. 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 21.914, -84.760. 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
2023-07-26 14:57Z
status
Archived notice
authority
SFH 0/23 261454Z JUL 23.
NAVAREA
NAVAREA IV
issued by
SFH
sea
Gulf of Mexico
position
21.914, -84.760
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 261440Z JUL:
   A. ARGOS 27-10.4N 090-21.9W.
   B. BLAKE 1007 27-22.0N 094-28.1W.
   C. (NEW POSITION) 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 CONQUEROR 28-23.3N 088-11.0W.
   G. DEEPWATER INVICTUS 27-44.1N 092-44.4W.
   H. (NEW POSITION) DEEPWATER PONTUS
      28-01.7N 089-09.7W.
   I. DEEPWATER POSEIDON 28-36.3N 087-56.4W.
   J. (NEW POSITION) DEEPWATER PROTEUS
      28-36.3N 088-02.3W.
   K. DEEPWATER THALASSA 26-09.5N 094-47.3W.
   L. DEEPWATER TITAN 28-01.4N 089-18.5W.
   M. DEVELOPMENT DRILLER III 07-13.5N 055-51.3W.
   N. DISCOVERER INSPIRATION 28-51.1N 090-05.8W.
   O. ENTERPRISE 264 29-11.5N 088-57.0W.
   P. ENTERPRISE 351 28-15.3N 091-26.0W.
   Q. FRIDA I 23-36.3N 091-26.4W.
   R. GALAR 18-30.5N 093-26.5W.
   S. GERSEMI 18-29.1N 093-21.6W.
   T. GRID 18-26.7N 094-08.2W.
   U. GSP ORIZONT 19-36.0N 090-58.0W.
   V. H&P RIG 100 28-56.8N 088-35.3W.
   W. H&P RIG 201 28-09.5N 089-12.7W.
   X. H&P RIG 205 26-06.6N 094-53.1W.
   Y. H&P RIG 406 27-33.8N 092-25.0W.
   Z. (NEW POSITION) HELIX Q5000
      27-36.3N 092-19.1W.
   AA. HOLSTEIN SPAR 27-19.6N 090-31.0W.
   AB. ISLAND INTERVENTION 27-13.5N 090-01.9W.
   AC. ISLAND PERFORMER 28-41.5N 088-11.3W.
   AD. (NEW RIG) ISLAND VENTURE
       27-13.7N 090-01.7W.
   AE. JOE DOUGLAS 10-22.0N 060-36.2W.
   AF. LIZA DESTINY 08-00.6N 056-59.5W.
   AG. LIZA UNITY 08-00.5N 056-54.8W.
   AH. MAD DOG 27-11.3N 090-16.4W.
   AI. MAERSK DISCOVERER 10-22.6N 061-35.4W.
   AJ. MSV OCEAN EVOLUTION 28-00.7N 089-10.3W.
   AK. NABORS MODS 140 28-12.4N 088-46.4W.
   AL. NABORS MODS 200 28-06.2N 090-12.1W.
   AM. NABORS MODS 400 26-55.8N 090-31.2W.
   AN. NOBLE BOB DOUGLAS 08-09.7N 056-58.2W.
   AO. NOBLE DON TAYLOR 07-57.4N 056-41.0W.
   AP. (NEW POSITION) NOBLE FAYE KOZACK
       26-11.4N 092-07.9W.
   AQ. NOBLE GLOBETROTTER I 20-11.6N 094-09.5W.
   AR. NOBLE GLOBETROTTER II 26-17.5N 094-24.2W.
   AS. NOBLE SAM CROFT 08-09.5N 056-57.5W.
   AT. NOBLE STANLEY LAFOSSE 26-32.4N 090-31.7W.
   AU. (NEW POSITION) NOBLE TOM MADDEN
       08-15.2N 056-57.8W.
   AV. (NEW RIG) NOBLE VALIANT
       26-02.1N 091-59.4W.
   AW. NOBLE VOYAGER 09-20.6N 076-50.1W.
   AX. OCEAN BLACKHORNET 28-28.5N 088-11.0W.
   AY. OCEAN BLACKLION 27-29.2N 089-58.4W.
   AZ. ODIN 18-18.3N 094-05.3W.
   AAA. OLYMPUS N88 28-09.6N 089-12.8W.
   AAB. PAPALOAPAN 19-29.0N 092-01.6W.
   AAC. PROSPERITY 08-11.5N 057-00.0W.
   AAD. RALPH COFFMAN 18-20.4N 093-53.6W.
   AAE. ROWAN EXL II 29-03.3N 091-27.7W.
   AAF. (NEW POSITION) ROWAN RELENTLESS
        26-12.4N 091-27.5W.
   AAG. (NEW POSITION) SAIPEM SANTORINI
        28-12.3N 088-46.5W.
   AAH. SEVAN LOUISIANA 27-53.4N 090-15.2W.
   AAI. (NEW POSITION) STENA CARRON
        07-24.9N 057-29.9W.
   AAJ. THUNDERHORSE PDQ 28-12.7N 088-28.9W.
   AAK. VALARIS 249 10-14.8N 060-30.9W.
   AAL. VALARIS DPS-5 20-15.8N 094-31.0W.
   AAM. (NEW POSITION) VALARIS DS-16
        27-24.5N 090-13.1W.
   AAN. (NEW POSITION) WELL SERVICES RIG 110
        10-10.5N 061-45.4W.
   AAO. (NEW POSITION) WELL SERVICES RIG 50
        10-40.6N 061-38.7W.
   AAP. (NEW POSITION) WEST AURIGA
        27-13.7N 090-01.9W.
   AAQ. WEST COURAGEOUS 19-35.1N 092-13.7W.
   AAR. WEST DEFENDER 18-40.4N 092-52.4W.
   AAS. WEST INTREPID 19-36.5N 092-15.5W.
   AAT. WEST NEPTUNE 28-26.7N 089-02.6W.
   AAU. WEST VELA 27-08.9N 090-19.3W.
   AAV. (NEW POSITION) WFD 250
        28-56.7N 090-22.0W.
   AAW. WFD 400 28-16.4N 092-06.2W.
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 812/23.

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

139 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

55 survey operations listed in force · see all

Record snapshot 2026-10-01 08:17Z; 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.