Seismic survey in progress until 09 apr by M/V nps sigma in area bound by 21-00.6S 039-44.0W, 21-11.4S…
South Atlantic Ocean · HYDROLANT 777/16
What this record establishes
Archived notice · 2016-04-10 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 286/16 010025Z APR 16.. Issued 2016-04-01 01:30Z. 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
- 2016-04-01 01:30Z
- status
- Archived notice
- authority
- NAVAREA V E 286/16 010025Z APR 16.
- NAVAREA
- NAVAREA V · named as the source of this relay
- issued by
- NAVAREA V E
- sea
- South Atlantic Ocean
- position
- -21.143, -39.806
- 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 IN PROGRESS UNTIL 09 APR BY M/V NPS SIGMA IN AREA BOUND BY 21-00.6S 039-44.0W, 21-11.4S 039-39.3W, 21-16.4S 039-53.0W, 21-06.1S 039-57.4W. 2. CANCEL HYDROLANT 729/16. 3. CANCEL THIS MSG 10 APR 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.
- 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
1387 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.
- Cable operations in progress until 03 feb 25 by cableship bold maverick in: a. 22-11.33S 041-06.38W2024-09-05
- Underwater operations 1100Z to 2100Z daily 19 thru 24 apr by cableship intrepid in 20-22.45S 040-11.23W2021-04-18
- Seismic survey in progress until 23 apr by nps sigma in area bound by 21-10.6S 039-55.5W, 21-10.5S…2016-04-12
- Seismic survey 10 thru 16 apr by nps sigma in area bound by 21-19.4S 039-57.5W, 21-17.3S 039-57.5W, 21-11.2S…2016-04-09
- Seismic survey 26 mar thru 02 apr by M/V nps sigma in area bound by 21-00.6S 039-44.0W, 21-11.4S 039-39.3W,…2016-03-27
- 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,…2016-03-18
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
- 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 · 75.9 nm
- Underwater operations in progress until 250259Z sep by M/V siem pilot in 22-25.32S 039-56.55WSurveys · 77.1 nm
- Underwater operations 1000Z to 2000Z daily until 02 nov 26 by M/V fugro vaquita in: a. 22-26.32S 040-25.47WSurveys · 85.3 nm
- RACON at cabo sao tome light 22-02.52S 041-03.17W off air until 28 sepNav aids · 88.1 nm
- Underwater operations in progress until 140001Z nov by M/V fugro vaquita in area bound by 22-03.00S…Surveys · 106.6 nm
Worldwide in the collected sources
23 cable & pipeline work listed in force · see all
Record snapshot 2026-09-24 20:22Z; 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.