Underwater operations by vessels Atlantis and Alvin near Cayman Islands from August 2 to August 18, within 100 miles of 18°23'N 081°47'W, wide berth requested.
Caribbean Sea · NAVAREA IV 743/26
What this record establishes
Cancelled notice · 2026-08-21 15:40Z
This notice disappeared from the issuing source's in-force list. No explicit recovery or all-clear is established by that removal.
- Source and dates
- NGA MSI in-force warnings (DailyMem*.txt). Issued 2026-07-31 19:22Z. First collected 2026-08-17 13:41Z; last seen in collection 2026-08-23 11:47Z. Collection dates record ingestion, not a new incident or a fresh field observation.
- Location covered
- Caribbean Sea. The parsed report position is 18.383, -81.783 with a 100.0 nm radius. It is a position in the source message, not a live location. Check the original wording for limits and qualifications.
Current notices and reporting history in the Caribbean Sea →
- issued
- 2026-07-31 19:22Z
- status
- Cancelled notice
- self-cancels
- 2026-08-18 09:00Z
- NAVAREA
- NAVAREA IV
- sea
- Caribbean Sea
- position
- 18.383, -81.783 · r 100.0 nm
- vessel
- M/V ATLANTIS · 37 messages
- nearest port
- Nueva Gerona · 219 nm
- source
- NGA MSI in-force warnings (DailyMem*.txt) · first seen 2026-08-17 13:41Z
Original warning text
CARIBBEAN SEA. CAYMAN ISLANDS. 1. UNDERWATER OPERATIONS 020800Z THRU 180800Z AUG BY M/V ATLANTIS AND SUBMERSIBLE ALVIN IN AREA WITHIN 100 MILES OF 18-23.00N 081-47.00W. WIDE BERTH REQUESTED. 2. CANCEL THIS MSG 180900Z AUG 26.
Reading this warning
- Underwater operations
- Divers or remotely operated vehicles are working below a vessel that cannot easily move out of the way.
- 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.
- Within a radius of
- A circular area — every position within a stated distance of a point.
- 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.
- Wide berth requested
- Keep well clear — or, when a distance is given ("TWO MILE BERTH REQUESTED"), at least that far away.
- CANCEL THIS MSG
- The warning's own expiry: a line telling the reader when the message cancels itself.
Collected reports in this area · survey operations
32 within 180 nm since 2021 · 1 in the last 12 months · 0 listed in force now
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.
- NAVAREA IV mobile offshore drilling units positions at 151850Z feb: a. argos 27-10.4N 090-21.9W2023-02-15
- NAVAREA IV mobile offshore drilling units positions at 021555Z nov: a. argos 27-10.4N 090-21.9W2022-11-03
- NAVAREA IV mobile offshore drilling units positions at 261524Z oct: a. argos 27-10.4N 090-21.9W2022-10-26
- NAVAREA IV mobile offshore drilling units positions at 191237Z oct: a. argos 27-10.4N 090-21.9W2022-10-19
- NAVAREA IV mobile offshore drilling units positions at 121506Z oct: a. argos 27-10.4N 090-21.9W2022-10-12
- NAVAREA IV mobile offshore drilling units positions at 051337Z oct: a. argos 27-10.4N 090-21.9W2022-10-05
Month of issue in the collected archive
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
56 survey operations listed in force · see all
Record snapshot 2026-09-28 09:05Z; 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.