Seismic survey by M/V bio hesperides towing 2000 meter long cables: a. 170400Z to 180400Z apr within ten…
North Atlantic Ocean · HYDROLANT 897/15
What this record establishes
Archived notice · 2015-04-28 05:00Z
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 124/15 150418Z APR.. Issued 2015-04-15 04:45Z. 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.
Current notices and reporting history in the North Atlantic Ocean →
Activity windows · 6 in this warning
| opens (UTC) | closes (UTC) | local | length |
|---|---|---|---|
| 2015-04-17 04:00Z | 2015-04-18 04:00Z | — | 24 h |
| 2015-04-19 04:00Z | 2015-04-20 04:00Z | — | 24 h |
| 2015-04-21 04:00Z | 2015-04-22 04:00Z | — | 24 h |
| 2015-04-23 04:00Z | 2015-04-24 04:00Z | — | 24 h |
| 2015-04-25 04:00Z | 2015-04-26 04:00Z | — | 24 h |
| 2015-04-27 04:00Z | 2015-04-28 04:00Z | — | 24 h |
Parsed from the warning text; outside these windows the area is normally not active, but the warning stays in force until cancelled.
- issued
- 2015-04-15 04:45Z
- status
- Archived notice
- self-cancels
- 2015-04-28 05:00Z
- authority
- NAVAREA II 124/15 150418Z APR.
- NAVAREA
- NAVAREA II · named as the source of this relay
- sea
- North Atlantic Ocean
- position
- 25.194, -17.317
- vessel
- M/V BIO HESPERIDES
- source
- NGA MSI broadcast-warn JSON (archive, frozen 2024-05) · first seen 2026-08-17 13:38Z
Original warning text
EASTERN NORTH ATLANTIC.
DNC 01.
1. SEISMIC SURVEY BY M/V BIO HESPERIDES TOWING
2000 METER LONG CABLES:
A. 170400Z TO 180400Z APR WITHIN TEN MILES OF
07-17N 023-55W.
B. 190400Z TO 200400Z APR WITHIN TEN MILES OF
10-52N 022-38W.
C. 210400Z TO 220400Z APR WITHIN TEN MILES OF
14-26N 021-20W.
D. 230400Z TO 240400Z APR WITHIN TEN MILES OF
18-03N 020-08W.
E. 250400Z TO 260400Z APR WITHIN TEN MILES OF
21-26N 018-43W.
F. 270400Z TO 280400Z APR WITHIN TEN MILES OF
25-11N 017-19W.
TWO MILE BERTH REQUESTED.
2. CANCEL THIS MSG 280500Z APR 15.
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.
- Seismic survey
- A survey that maps the rock beneath the seabed with sound pulses from air guns, recorded on streamers kilometres long.
- Towed array / streamer
- Equipment towed a long way behind a vessel — sonar, a hydrophone cable, a sampling sled — invisible at the surface.
- Tow / towing
- A vessel towing another vessel, a barge or a structure — slow, hard to manoeuvre, and with a long line between.
- 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 · cable & pipeline work
36 within 180 nm since 1999 · 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.
- Cable operations in progress until further notice by cableship ile d'ouessant in area bound by 23-56.90N…2024-04-12
- Cable operations 09 mar until further notice by cableship ile d'ouessant in area bound by 23-50.50N…2024-03-06
- Cable operations 01 mar thru 15 apr by cableship ile d'ouessant in area bound by 23-50.50N 016-09.50W,…2024-02-27
- Cable operations 241200Z nov until further notice by M/V ile de batz along trackline joining 30-33.60N…2023-11-23
- Cable operations 250001Z nov until further notice by M/V ile de batz along trackline joining 20-05.60N…2023-11-22
- Cable operations 100001Z oct thru 152359Z nov by cableship cable vigilance in area bound by 23-59.20N…2023-10-09
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 · 109.8 nm
Worldwide in the collected sources
24 cable & pipeline work listed in force · see all
Record snapshot 2026-10-02 05:47Z; source collection times vary.
Cable ops
Cable laying, pipeline and seismic operations. All current cable & pipeline work →
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.