Surveys

Survey operations 221000Z to 221700Z oct by M/V marion dufresne in area within two miles of 12-17.3S 046-02.1E

Mozambique Channel · HYDROPAC 3083/20

What this record establishes

Archived notice · 2020-10-22 18:00Z

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) · MRCC REUNION 220620Z OCT 20.. Issued 2020-10-22 07:19Z. 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
Mozambique Channel. The parsed report position is -12.288, 46.035 with a 2.0 nm radius. It is a position in the source message, not a live location. Check the original wording for limits and qualifications.

Related notices and cancellation links

Current notices and reporting history in the Mozambique Channel →

Activity windows · 1 in this warning

opens (UTC)closes (UTC)locallength
2020-10-22 10:00Z2020-10-22 17:00Z—7 h

Parsed from the warning text; outside these windows the area is normally not active, but the warning stays in force until cancelled.

issued
2020-10-22 07:19Z
status
Archived notice
self-cancels
2020-10-22 18:00Z
authority
MRCC REUNION 220620Z OCT 20.
issued by
MRCC REUNION
sea
Mozambique Channel
position
-12.288, 46.035 · r 2.0 nm
vessel
M/V MARION DUFRESNE · 51 messages
source
NGA MSI broadcast-warn JSON (archive, frozen 2024-05) · first seen 2026-08-17 13:38Z

Original warning text

MOZAMBIQUE CHANNEL.
DNC 02.
1. SURVEY OPERATIONS 221000Z TO 221700Z OCT
   BY M/V MARION DUFRESNE
   IN AREA WITHIN TWO MILES OF 12-17.3S 046-02.1E.
   WIDE BERTH REQUESTED.
2. CANCEL HYDROPAC 2899/20.
3. CANCEL THIS MSG 221800Z OCT 20.

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.
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.
Within a radius of
A circular area — every position within a stated distance of a point.
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.
HYDROPAC
The U.S. long-range warning series for the Pacific outside NAVAREA XII and for the Indian Ocean, Persian Gulf and adjoining seas.
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 · survey operations

24 within 180 nm since 2008 · 2 in the last 12 months · 1 listed in force now

08
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

56 survey operations listed in force · see all

Record snapshot 2026-09-28 17:02Z; 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.