Seismic survey 060300Z to 130259Z apr by M/V ramform soverign towing 12 five mile long cables in area bound…
South Atlantic Ocean · HYDROLANT 851/13
What this record establishes
Archived notice · 2013-04-13 03:59Z
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 V S 421/13 032341Z APR 13.. Issued 2013-04-04 00:40Z. 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 →
Activity windows · 1 in this warning
| opens (UTC) | closes (UTC) | local | length |
|---|---|---|---|
| 2013-04-06 03:00Z | 2013-04-13 02:59Z | — | 167 h 59 |
Parsed from the warning text; outside these windows the area is normally not active, but the warning stays in force until cancelled.
- issued
- 2013-04-04 00:40Z
- status
- Archived notice
- self-cancels
- 2013-04-13 03:59Z
- authority
- NAVAREA V S 421/13 032341Z APR 13.
- NAVAREA
- NAVAREA V · named as the source of this relay
- issued by
- NAVAREA V S
- sea
- South Atlantic Ocean
- position
- -25.803, -45.075
- vessel
- M/V RAMFORM SOVERIGN · 3 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 060300Z TO 130259Z APR BY M/V RAMFORM SOVERIGN TOWING 12 FIVE MILE LONG CABLES IN AREA BOUND BY 25-22.50S 045-19.15W, 25-22.50S 044-49.80W, 26-13.80S 044-49.72W, 26-13.80S 045-19.30W. SEVEN MILE BERTH REQUESTED. 2. CANCEL THIS MSG 130359Z 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.
- 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.
- 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
1618 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 by cableship rebecca: a. 191000Z to 252359Z jan along trackline joining 14-49.32S…2024-01-15
- Cable operations in progress until 30 mar 24 by cableship durable in: a. 24-05.68S 046-30.76W2023-12-27
- Cable operations in progress thru 03 jan 24 by M/V puerto real in area bound by 24-31.30S 042-12.30W,…2023-06-23
- Seismic survey in progress until 09 oct by M/V sw diamond towing nine 225 meter long cables in area bound by…2022-10-07
- Cable operations in progress until 241100Z feb 21 by cableship peter faber and cableship recorder in: a.…2020-11-26
- Cable operations in progress until 251100Z nov by cableship peter faber and cableship recorder in: a.…2020-09-30
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 03:45Z; 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.