Surveys
Underwater operations 21 thru 24 nov by M/V poseidon in area between 28-00N 27-40N and 014-48W 014-25W
Eastern North Atlantic · Canary Islands · HYDROLANT 1937/11
What this record establishes
Archived notice · 2011-11-25 00:01Z
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) · NAVAREA II 420/11 190433Z NOV 11 - WZ 1184/11 171442Z NOV 11 - WZ 1191/11 181521Z NOV 11.. Issued 2011-11-19 06:36Z. 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
- Eastern North Atlantic · Canary Islands. No usable coordinates were parsed; a location-based nearby search is unavailable. Check the original wording for limits and qualifications.
Related notices and cancellation links
- Nga chart 36006 (1ST ed)cancelled by this notice
- Nga chart 35119 (2ND ed)cancelled by this notice
- Hazardous operations 1800Z to 0400Z commencing daily 29 nov thru 07 dec in area bound by 05-46.00S…later cancellation notice
- issued
- 2011-11-19 06:36Z
- status
- Archived notice
- authority
- NAVAREA II 420/11 190433Z NOV 11 - WZ 1184/11 171442Z NOV 11 - WZ 1191/11 181521Z NOV 11.
- NAVAREA
- NAVAREA II · named as the source of this relay
- vessel
- M/V POSEIDON · 64 messages
- source
- NGA MSI broadcast-warn JSON (archive, frozen 2024-05) · first seen 2026-08-17 13:38Z
Original warning text
EASTERN NORTH ATLANTIC. CANARY ISLANDS. 1. UNDERWATER OPERATIONS 21 THRU 24 NOV BY M/V POSEIDON IN AREA BETWEEN 28-00N 27-40N AND 014-48W 014-25W. WIDE BERTH REQUESTED. 2. CANCEL HYDROLANT 1917/11(36) AND 1919/11(35), AIDS RESTORED. 3. CANCEL THIS MSG 25 NOV.
Reading this warning
- Underwater operations
- Divers or remotely operated vehicles are working below a vessel that cannot easily move out of the way.
- 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.
- Cancellation reference
- A line that cancels an earlier warning by its number, such as CANCEL HYDROLANT 1085/12.
- HYDROLANT
- The U.S. long-range warning series for Atlantic waters outside NAVAREA IV, including the eastern Atlantic, the Mediterranean and adjoining seas.
- CANCEL THIS MSG
- The warning's own expiry: a line telling the reader when the message cancels itself.
Nearby notices listed in force · within 120 nm
No parsed position is available for this comparison.
Worldwide in the collected sources
54 survey operations listed in force · see all
Record snapshot 2026-10-02 13:29Z; 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.