Underwater operations 05 thru 23 apr by M/V poseidon in area bound by 28-00N 020-00W, 30-00N 022-00W, 40-00N…
North Atlantic Ocean · HYDROLANT 541/07
What this record establishes
Archived notice · 2007-04-06 13:06Z
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 128/07 041649Z APR 07.. Issued 2007-04-04 17:38Z. 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
- North Atlantic Ocean. The map shows an area described by the warning; the listed coordinate is its representative center. Check the original wording for limits and qualifications.
Related notices and cancellation links
- Cancel HYDROLANT 541/07 and this msg, operations suspendedlater cancellation notice
Current notices and reporting history in the North Atlantic Ocean →
- issued
- 2007-04-04 17:38Z
- status
- Archived notice
- authority
- NAVAREA II 128/07 041649Z APR 07.
- NAVAREA
- NAVAREA II · named as the source of this relay
- sea
- North Atlantic Ocean
- position
- 34.000, -21.000
- 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
1. UNDERWATER OPERATIONS 05 THRU 23 APR BY M/V POSEIDON IN AREA BOUND BY 28-00N 020-00W, 30-00N 022-00W, 40-00N 022-00W, 38-00N 020-00W. WIDE BERTH REQUESTED. 2. CANCEL THIS MSG 24 APR.
Reading this warning
- Underwater operations
- Divers or remotely operated vehicles are working below a vessel that cannot easily move out of the way.
- Area bound by
- Introduces a list of positions that are the corners of an area — the polygon the warning applies to.
- 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
7 within 180 nm since 2000 · 0 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.
- Survey operations from 26 may thru 23 jun by sarmiento de gamboa in area bound by 20-02N 021-02W, 25-00N…2018-05-25
- Hydrographic survey 03 thru 10 dec by M/V d. carlos I in area bound by 32-09.78N 021-54.43W, 32-11.59N…2012-12-02
- Oceanographic operations 17 oct thru 11 nov by M/V hesperides along trackline joining 37-00.0N 010-02.7W,…2009-10-16
- Underwater operations in progress until 23 apr by M/V poseidon in area bound by 28-00N 020-00W, 30-00N…2007-04-07
- Oceanographic operations 10 thru 20 apr by M/V poseidon along trackline joining 30-00N 024-00W, 33-00N…2000-04-08
- Oceanographic operations 10 thru 20 apr by M/V poseidon along trackline joining 30-00N 024-00W, 33-00N…2000-04-07
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
55 survey operations listed in force · see all
Record snapshot 2026-10-02 04:03Z; 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.