Survey operations in progress until 29 apr by M/V maria s. merian in area bound by 26-12.00N 016-30.00W,…
North Atlantic Ocean · HYDROLANT 646/24
What this record establishes
Archived notice · 2024-04-19 16:52Z
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 87/24 290902Z MAR 24.. Issued 2024-03-29 09:19Z. 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 646/24 and this msg, operations completedlater cancellation notice
Current notices and reporting history in the North Atlantic Ocean →
- issued
- 2024-03-29 09:19Z
- status
- Archived notice
- self-cancels
- 2024-04-30 00:01Z
- authority
- NAVAREA II 87/24 290902Z MAR 24.
- NAVAREA
- NAVAREA II · named as the source of this relay
- sea
- North Atlantic Ocean
- position
- 23.998, -16.588
- vessel
- M/V MARIA S MERIAN · 25 messages
- source
- NGA MSI broadcast-warn JSON (archive, frozen 2024-05) · first seen 2026-08-17 13:38Z
Original warning text
EASTERN NORTH ATLANTIC. WESTERN SAHARA. DNC 01. 1. SURVEY OPERATIONS IN PROGRESS UNTIL 29 APR BY M/V MARIA S. MERIAN IN AREA BOUND BY 26-12.00N 016-30.00W, 27-00.00N 015-00.00W, 20-30.00N 017-30.00W, 20-18.00N 018-00.00W. WIDE BERTH REQUESTED. 2. CANCEL THIS MSG 300001Z APR 24.
Reading this warning
- DNC (Digital Nautical Chart)
- A reference to one of the regions of NGA's Digital Nautical Chart, used to tell the reader which charts a warning affects.
- Survey operations
- A research or survey vessel is mapping the seabed or water column, often while towing equipment.
- 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.
- 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.
Collected reports in this area · survey operations
11 within 180 nm since 2002 · 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.
- Underwater operations 010000Z aug until further notice by M/V 7 waves in area bound by 23-53.00N 016-48.00W,…2023-07-27
- Survey operations in progress until further notice by M/V sarmiento de gamboa in area bound by 27-10.20N…2022-11-10
- Survey operations in progress until 251200Z mar by M/V discovery along trackline joining 25-40.9N 019-21.7W,…2022-02-22
- Underwater operations in progress until 201200Z jun notice by M/V polarstern along trackline joining…2019-06-18
- Survey operations in progress until 31 jul by M/V bgp prospector towing 12 four mile long cables in area…2018-02-02
- Survey operations 250001Z feb thru 112359Z apr by M/V bgp prospector in area bound by 25-58.67N 016-54.74W,…2017-02-24
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
- Newly discovered dangersWrecks · 41.5 nm
Worldwide in the collected sources
56 survey operations listed in force · see all
Record snapshot 2026-10-01 19:02Z; 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.