Cable ops

Seismic survey 19 thru 26 mar by M/V nps sigma in area bound by 21-19.07S 039-57.08W, 21-17.05S 039-57.08W,…

South Atlantic Ocean · HYDROLANT 662/16

What this record establishes

Archived notice · 2016-03-27 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 E 240/16 180035Z MAR 16.. Issued 2016-03-18 04:37Z. 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.

Current notices and reporting history in the South Atlantic Ocean →

issued: 2016-03-18 04:37Z
status: Archived notice
authority: NAVAREA V E 240/16 180035Z MAR 16.
NAVAREA: NAVAREA V · named as the source of this relay
issued by: NAVAREA V E
sea: South Atlantic Ocean
position: -20.921, -39.872
vessel: M/V NPS SIGMA · 11 messages
source: NGA MSI broadcast-warn JSON (archive, frozen 2024-05) · first seen 2026-08-17 13:38Z

Original warning text

BRAZIL-SOUTHEAST COAST.
DNC 01.
1. SEISMIC SURVEY 19 THRU 26 MAR BY
   M/V NPS SIGMA IN AREA BOUND BY
   21-19.07S 039-57.08W, 21-17.05S 039-57.08W,
   21-11.03S 039-52.08W, 21-14.05S 039-48.05W,
   20-19.07S 039-52.05W.
2. CANCEL THIS MSG 27 MAR 16.

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.
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.
CANCEL THIS MSG: The warning's own expiry: a line telling the reader when the message cancels itself.

All warning terms →

Collected reports in this area · cable & pipeline work

1352 within 180 nm since 1998 · 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.

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

Underwater operations 0800Z to 1800Z daily 26 sep thru 10 oct by M/V comando b in 20-23.78S 040-09.43WSurveys · 35.3 nm
Foul ground until 06 dec 27 in area bound by 19-53.87S 039-59.68W, 19-54.15S 039-59.27W, 19-53.08S…Wrecks · 62.1 nm
Underwater operations 0800Z to 1800Z daily 26 sep thru 10 oct by M/V comando b in 19-51.63S 039-56.90WSurveys · 63.8 nm
Underwater operations 1000Z to 2000Z daily until 02 nov 26 by M/V fugro vaquita in: a. 22-26.32S 040-25.47WSurveys · 96.4 nm

Worldwide in the collected sources

24 cable & pipeline work listed in force · see all

Record snapshot 2026-10-02 13:36Z; 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.