Cable ops

Seismic survey operations in progress until 011830Z may by M/V sw empress in area bound by 11-09.00N…

Bay of Bengal · HYDROPAC 478/24

What this record establishes

Archived notice · 2024-05-01 19:30Z

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 VIII 159/24 091013Z FEB 24.. Issued 2024-02-09 11:21Z. 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
Bay of Bengal. 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 Bay of Bengal →

issued
2024-02-09 11:21Z
status
Archived notice
self-cancels
2024-05-01 19:30Z
authority
NAVAREA VIII 159/24 091013Z FEB 24.
NAVAREA
NAVAREA VIII · named as the source of this relay
sea
Bay of Bengal
position
11.677, 80.612
vessel
M/V SW EMPRESS · 48 messages
source
NGA MSI broadcast-warn JSON (archive, frozen 2024-05) · first seen 2026-08-17 13:38Z

Original warning text

BAY OF BENGAL.
INDIA.
DNC 03.
1. SEISMIC SURVEY OPERATIONS IN PROGRESS UNTIL 011830Z MAY
   BY M/V SW EMPRESS IN AREA BOUND BY
   11-09.00N 080-13.00E, 11-33.00N 080-13.00E,
   12-16.00N 080-23.00E, 12-16.00N 080-51.00E,
   12-06.00N 080-58.00E, 11-09.00N 080-58.00E.
   WIDE BERTH REQUESTED.
2. CANCEL THIS MSG 011930Z MAY 24.

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.
Survey operations
A research or survey vessel is mapping the seabed or water column, often while towing equipment.
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.
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.

All warning terms →

Collected reports in this area · cable & pipeline work

54 within 180 nm since 2004 · 0 in the last 12 months · 0 listed in force now

04
05
10
15
20
25

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

J
F
M
A
M
J
J
A
S
O
N
D

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

Worldwide in the collected sources

24 cable & pipeline work listed in force · see all

Record snapshot 2026-10-02 07:16Z; 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.