Underwater operations 1000Z to 2000Z daily 20 feb thru 06 may by cableship rene descartes along trackline…
South Atlantic Ocean · HYDROLANT 1247/18
What this record establishes
Archived notice · 2018-04-26 01:00Z
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 V 75/18 200014Z APR 18.. Issued 2018-04-20 00:24Z. 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 the reported line or operation extent; it is not a vessel track. Check the original wording for limits and qualifications.
Related notices and cancellation links
- Underwater operations in progress 1000Z to 2000Z daily until 29 may by cableship rene descartes along…cancelled by this notice
- Cancel HYDROLANT 1247/18 and this msglater cancellation notice
Current notices and reporting history in the South Atlantic Ocean →
Activity windows · 76 in this warning
| opens (UTC) | closes (UTC) | local | length |
|---|---|---|---|
| 2018-02-20 10:00Z | 2018-02-20 20:00Z | — | 10 h |
| 2018-02-21 10:00Z | 2018-02-21 20:00Z | — | 10 h |
| 2018-02-22 10:00Z | 2018-02-22 20:00Z | — | 10 h |
| 2018-02-23 10:00Z | 2018-02-23 20:00Z | — | 10 h |
| 2018-02-24 10:00Z | 2018-02-24 20:00Z | — | 10 h |
| 2018-02-25 10:00Z | 2018-02-25 20:00Z | — | 10 h |
| 2018-02-26 10:00Z | 2018-02-26 20:00Z | — | 10 h |
| 2018-02-27 10:00Z | 2018-02-27 20:00Z | — | 10 h |
| … 68 more | |||
Parsed from the warning text; outside these windows the area is normally not active, but the warning stays in force until cancelled.
- issued
- 2018-04-20 00:24Z
- status
- Archived notice
- self-cancels
- 2018-05-06 21:00Z
- authority
- NAVAREA V 75/18 200014Z APR 18.
- NAVAREA
- NAVAREA V · named as the source of this relay
- sea
- South Atlantic Ocean
- position
- -3.076, -33.889
- source
- NGA MSI broadcast-warn JSON (archive, frozen 2024-05) · first seen 2026-08-17 13:38Z
Original warning text
WESTERN SOUTH ATLANTIC. BRAZIL-NORTH COAST. DNC 01. 1. UNDERWATER OPERATIONS 1000Z TO 2000Z DAILY 20 FEB THRU 06 MAY BY CABLESHIP RENE DESCARTES ALONG TRACKLINE JOINING 03-43.92S 038-27.42W, 03-43.36S 038-26.01W, 03-37.82S 038-18.74W, 03-34.49S 038-16.57W, 03-36.46S 038-10.83W, 03-36.21S 038-07.66W, 03-35.98S 038-05.57W, 03-36.17S 038-04.61W, 03-37.35S 038-01.97W, 03-37.94S 038-00.31W, 03-40.01S 037-55.44W, 03-41.59S 037-54.23W, 03-43.91S 037-52.55W, 03-43.62S 037-50.77W, 03-46.65S 037-48.02W, 03-47.36S 037-47.10W, 03-48.58S 037-41.02W, 03-47.78S 037-39.08W, 03-46.83S 037-35.02W, 03-45.02S 037-26.74W, 03-44.09S 037-18.07W, 03-41.27S 037-14.18W, 03-43.69S 036-56.85W, 03-43.46S 036-30.02W, 03-30.57S 035-48.50W, 03-15.27S 035-44.72W, 02-53.43S 035-23.84W, 02-47.68S 035-14.85W, 02-40.28S 034-27.65W, 02-45.24S 034-04.05W, 02-45.21S 033-06.60W, 02-47.94S 031-12.61W, 02-53.14S 029-57.76W, 02-53.20S 029-00.78W. WIDE BERTH REQUESTED. 2. CANCEL HYDROLANT 998/18. 3. CANCEL THIS MSG 062100Z MAY 18.
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.
- Underwater operations
- Divers or remotely operated vehicles are working below a vessel that cannot easily move out of the way.
- Cable operations
- A ship is laying, burying or repairing a submarine cable, usually along a stated route.
- Track line joining
- Introduces a route through a series of positions — a cable route, a tow's track or a survey line.
- 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.
- 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.
Collected reports in this area · cable & pipeline work
43 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.
- Underwater operations 1000Z to 2000Z daily 10 may thru 20 sep by cableship recorder and M/V saga badejo in…2018-08-10
- Underwater operations 1000Z to 2000Z daily 10 may thru 09 aug by cableship recorder and M/V saga badejo in…2018-05-10
- Underwater operations in progress 1000Z to 2000Z daily until 29 may by cableship rene descartes along…2018-03-24
- Underwater operations in progress 1000Z to 2000Z daily until 29 may by cableship rene descartes along…2018-02-17
- Underwater operations in progress until 062222Z jun by cableship ile de brehat along trackline joining…2017-05-20
- Seismic survey 19 thru 27 jan by M/V bgp challenger towing 10000 meter long cable in area bound by 04-09S…2017-01-18
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
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 04:59Z; 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.