Surveys

NAVAREA IV mobile offshore drilling units positions at 101500Z apr: a

Gulf of Mexico · NAVAREA IV 412/24

What this record establishes

Archived notice · 2024-04-17 15:50Z

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 0/24 101501Z APR 24.. Issued 2024-04-10 15:34Z. 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 22.160, -84.801. 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
2024-04-10 15:34Z
status
Archived notice
authority
SFH 0/24 101501Z APR 24.
NAVAREA
NAVAREA IV
issued by
SFH
sea
Gulf of Mexico
position
22.160, -84.801
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 101500Z APR:
   A. (NEW POSITION) ARGOS 27-10.4N 090-22.1W.
   B. BLAKE 1007 27-22.0N 094-28.1W.
   C. BORR HILD 19-02.6N 092-26.6W.
   D. BORR RAN 18-47.5N 092-57.0W.
   E. COATZACOALCOS 19-28.9N 091-57.0W.
   F. DEEPWATER ASGARD 27-29.8N 090-33.5W.
   G. DEEPWATER ATLAS 26-54.2N 091-35.6W.
   H. DEEPWATER CONQUEROR 27-09.7N 091-14.9W.
   I. DEEPWATER INVICTUS 28-44.2N 088-20.3W.
   J. DEEPWATER PONTUS 28-01.7N 089-09.7W.
   K. (NEW RIG) DEEPWATER POSEIDON
      28-36.5N 088-02.4W.
   L. DEEPWATER PROTEUS 28-09.6N 089-07.0W.
   M. DEEPWATER THALASSA 26-12.2N 094-44.6W.
   N. DEEPWATER TITAN 27-09.7N 091-12.0W.
   O. DEVELOPMENT DRILLER III 12-26.5N 070-06.5W.
   P. DISCOVERER INSPIRATION 28-51.1N 090-05.8W.
   Q. ENTERPRISE 351 28-15.3N 091-26.0W.
   R. FRIDA I 19-36.1N 092-31.6W.
   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 201 28-09.4N 089-13.0W.
   X. H&P RIG 205 26-06.6N 094-53.1W.
   Y. HELIX Q4000 27-28.7N 092-51.4W.
   Z. (NEW POSITION) HELIX Q5000
      26-06.9N 094-47.4W.
   AA. HOLSTEIN SPAR 27-19.6N 090-31.0W.
   AB. JOE DOUGLAS 09-59.7N 060-18.4W.
   AC. LIZA DESTINY 08-00.6N 056-59.5W.
   AD. LIZA UNITY 08-00.5N 056-54.8W.
   AE. MAD DOG 27-11.6N 090-16.5W.
   AF. MSV OCEAN EVOLUTION 28-00.7N 089-10.3W.
   AG. NABORS MODS 140 28-12.4N 088-46.4W.
   AH. NABORS MODS 200 28-06.2N 090-12.1W.
   AI. NABORS MODS 400 26-55.7N 090-31.4W.
   AJ. NFE PIONEER III 22-39.2N 097-40.8W.
   AK. NOBLE BOB DOUGLAS 07-58.7N 056-41.3W.
   AL. (NEW POSITION) NOBLE DON TAYLOR
       08-00.4N 056-43.0W.
   AM. NOBLE GLOBETROTTER I 27-52.0N 092-01.3W.
   AN. NOBLE GLOBETROTTER II 28-09.6N 089-07.1W.
   AO. NOBLE SAM CROFT 07-59.0N 056-57.0W.
   AP. (NEW POSITION) NOBLE STANLEY LAFOSSE
       27-33.7N 090-06.3W.
   AQ. NOBLE TOM MADDEN 08-09.0N 056-57.0W.
   AR. NOBLE VALIANT 26-17.8N 092-39.7W.
   AS. NOBLE VOYAGER 07-22.5N 055-32.9W.
   AT. (NEW POSITION) OCEAN BLACKHAWK
       28-57.4N 087-59.6W.
   AU. OCEAN BLACKHORNET 28-02.0N 088-22.0W.
   AV. OCEAN BLACKLION 27-08.9N 090-19.4W.
   AW. ODIN 18-18.3N 094-05.3W.
   AX. OLYMPUS N88 28-09.6N 089-12.8W.
   AY. PAPALOAPAN 19-29.0N 092-01.6W.
   AZ. PROSPERITY 08-11.7N 057-00.1W.
   AAA. RALPH COFFMAN 18-20.4N 093-53.6W.
   AAB. ROWAN EXL II 29-03.3N 091-27.7W.
   AAC. SAIPEM SANTORINI 28-12.3N 088-46.5W.
   AAD. (NEW POSITION) STENA CARRON
        07-57.7N 056-41.3W.
   AAE. (NEW POSITION) STENA DRILLMAX
        07-58.0N 056-53.4W.
   AAF. STENA ICEMAX 28-10.0N 088-28.7W.
   AAG. THUNDERHORSE PDQ 28-10.0N 088-28.7W.
   AAH. TUXPAN 18-45.8N 091-45.7W.
   AAI. VALARIS 249 10-05.3N 060-35.4W.
   AAJ. VALARIS DPS-5 29-17.4N 088-00.3W.
   AAK. VALARIS DS-16 28-54.6N 088-05.7W.
   AAL. VALARIS DS-18 28-23.3N 088-14.1W.
   AAM. WELL SERVICES RIG 50 10-40.6N 061-38.7W.
   AAN. WEST COURAGEOUS 19-35.1N 092-13.7W.
   AAO. WEST DEFENDER 18-40.4N 092-52.4W.
   AAP. WEST INTREPID 19-36.5N 092-15.5W.
   AAQ. WEST NEPTUNE 26-12.8N 092-08.1W.
   AAR. WEST VELA 28-08.8N 089-51.3W.
   AAS. WFD 250 28-31.2N 091-31.6W.
   AAT. WFD 400 28-17.0N 091-40.4W.
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 390/24.

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

143 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 14:26Z; 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.