Surveys

Survey operations in progress until 14 jun by M/V trewenna, M/V wenna and M/V KOHINOOR1 in area bound by…

Arabian Sea · HYDROPAC 1605/23

What this record establishes

Archived notice · 2023-05-19 11:37Z

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 477/23 151006Z MAY 23.. Issued 2023-05-15 11:43Z. 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
Arabian Sea. 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 Arabian Sea →

issued
2023-05-15 11:43Z
status
Archived notice
self-cancels
2023-06-15 00:01Z
authority
NAVAREA VIII 477/23 151006Z MAY 23.
NAVAREA
NAVAREA VIII · named as the source of this relay
sea
Arabian Sea
position
21.994, 72.441
vessels
M/V KOHINOOR1M/V TREWENNA · 5 messagesM/V WENNA · 5 messages
source
NGA MSI broadcast-warn JSON (archive, frozen 2024-05) · first seen 2026-08-17 13:38Z

Original warning text

GULF OF KHAMBHAT.
INDIA.
DNC 03.
1. SURVEY OPERATIONS IN PROGRESS UNTIL 14 JUN
   BY M/V TREWENNA, M/V WENNA AND M/V KOHINOOR1
   IN AREA BOUND BY
   22-12.90N 072-22.60E, 22-12.96N 072-25.09E,
   22-11.22N 072-25.15E, 22-11.27N 072-28.65E,
   22-13.02N 072-28.59E, 22-13.08N 072-30.73E,
   22-02.88N 072-30.88E, 22-02.85N 072-30.27E,
   21-52.76N 072-30.36E, 21-52.69N 072-33.45E,
   21-49.19N 072-33.47E, 21-48.98N 072-19.75E,
   21-54.34N 072-19.72E, 21-54.35N 072-22.68E.
   WIDE BERTH REQUESTED.
2. CANCEL THIS MSG 150001Z JUN 23.

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

All warning terms →

Collected reports in this area · survey operations

421 within 180 nm since 2005 · 25 in the last 12 months · 1 listed in force now

05
10
15
20
25
26

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

55 survey operations listed in force · see all

Record snapshot 2026-10-02 04:36Z; source collection times vary.

Surveys

Hydrographic and scientific survey vessels, often towing long arrays. All current survey operations →

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.