Seismic survey by M/V hawk explorer towing 12000 meter long cables: a. in progress until 30 mar in area…
South Atlantic Ocean · HYDROLANT 805/13
What this record establishes
Archived notice · 2013-04-02 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 V S 391/13 290035Z MAR 13.. Issued 2013-03-29 01:29Z. 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
- South 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 South Atlantic Ocean →
- issued
- 2013-03-29 01:29Z
- status
- Archived notice
- authority
- NAVAREA V S 391/13 290035Z MAR 13.
- NAVAREA
- NAVAREA V · named as the source of this relay
- issued by
- NAVAREA V S
- sea
- South Atlantic Ocean
- position
- -34.444, -50.341
- vessel
- M/V HAWK EXPLORER · 214 messages
- source
- NGA MSI broadcast-warn JSON (archive, frozen 2024-05) · first seen 2026-08-17 13:38Z
Original warning text
BRAZIL-SOUTH COAST.
1. SEISMIC SURVEY BY M/V HAWK EXPLORER TOWING
12000 METER LONG CABLES:
A. IN PROGRESS UNTIL 30 MAR IN AREA BOUND BY
33-36.02S 050-11.48W, 34-31.08S 051-09.97W,
34-45.43S 050-50.37W, 33-50.29S 049-51.93W.
B. 31 MAR AND 01 APR IN AREA BOUND BY
34-45.43S 050-50.37W, 33-55.27S 051-29.53W,
33-50.29S 049-51.93W, 35-28.60S 049-27.92W.
SIX MILE BERTH REQUESTED.
2. CANCEL HYDROLANT 762/13.
3. CANCEL THIS MSG 02 APR 13.
Reading this warning
- 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.
- 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
492 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.
- Cable operations in progress until further notice by cableship ile de sein along trackline joining 36-35.59S…2020-09-18
- Cable operations in progress until further notice by cableship ile de sein along trackline joining 35-54.40S…2020-09-02
- Cable operations in progress until 302300Z sep by cableship ile de brehat in area bound by 34-58.0S…2017-08-28
- Cable operations in progress until 302300Z sep by cableship ile de brehat in area bound by 34-58.0S…2017-08-16
- Underwater operations in progress until 302359Z aug by cableship ile de brehat in: a. 36-03.5S 049-41.7W b.…2017-08-16
- Cable operations 150500Z aug to 302300Z sep by cableship ile de brehat in area bound by 34-58.0S 054-54.0W,…2017-08-14
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
23 cable & pipeline work listed in force · see all
Record snapshot 2026-10-03 22:36Z; 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.