Seismic survey in progress until 052359Z jun by M/V sanco swift towing 12 9000 meter long cables in area…
North Atlantic Ocean · HYDROLANT 1433/17
What this record establishes
Archived notice · 2017-06-06 00:59Z
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 169/17 051613Z MAY 17.. Issued 2017-05-05 16:17Z. 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
Current notices and reporting history in the North Atlantic Ocean →
- issued
- 2017-05-05 16:17Z
- status
- Archived notice
- self-cancels
- 2017-06-06 00:59Z
- authority
- NAVAREA II 169/17 051613Z MAY 17.
- NAVAREA
- NAVAREA II · named as the source of this relay
- sea
- North Atlantic Ocean
- position
- 18.345, -17.675
- vessel
- M/V SANCO SWIFT · 38 messages
- source
- NGA MSI broadcast-warn JSON (archive, frozen 2024-05) · first seen 2026-08-17 13:38Z
Original warning text
EASTERN NORTH ATLANTIC. MAURITANIA. DNC 01. 1. SEISMIC SURVEY IN PROGRESS UNTIL 052359Z JUN BY M/V SANCO SWIFT TOWING 12 9000 METER LONG CABLES IN AREA BOUND BY 19-14N 016-56W, 19-14N 018-38W, 17-37N 018-38W, 17-24N 016-35W. SIX MILE BERTH REQUESTED. 2. CANCEL HYDROLANT 725/17. 3. CANCEL THIS MSG 060059Z JUN 17.
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.
- 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.
- 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.
- 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.
- 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.
Collected reports in this area · cable & pipeline work
33 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 15 sep by cableship teliri in 20-23.76N 019-34.50W2022-09-07
- Cable operations 01 thru 10 sep by cableship teliri in 20-23.76N 019-34.50W2022-08-28
- Cable operations in progress until 15 sep by M/V teliri and M/V thetys II in area bound by 20-45.28N…2022-08-19
- Pipeline operations 22 jun thru 22 dec in areas within two miles of: a. 16-03.30N 016-52.50W2022-06-19
- Pipeline operations in progress until 22 jun in area within three miles of 16-04.00N 016-53.00W2022-06-12
- Cable operations 230400Z apr to 072359Z jun by M/V rebecca along tracklines joining: a. 15-06.34N…2022-04-21
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
24 cable & pipeline work listed in force · see all
Record snapshot 2026-10-02 06:27Z; 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.