Surveys

Survey operations in progress until 19 may by M/V marion dufresne towing equipment in area bound by 12-15S…

Mozambique Channel · HYDROPAC 1476/19

What this record establishes

Archived notice · 2019-05-20 00:01Z

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 VII 167/19 021556Z MAY 19.. Issued 2019-05-02 16:02Z. 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 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 Mozambique Channel →

issued: 2019-05-02 16:02Z
status: Archived notice
authority: NAVAREA VII 167/19 021556Z MAY 19.
NAVAREA: NAVAREA VII · named as the source of this relay
sea: Mozambique Channel
position: -12.792, 45.500
vessel: M/V MARION DUFRESNE · 52 messages
source: NGA MSI broadcast-warn JSON (archive, frozen 2024-05) · first seen 2026-08-17 13:38Z

Original warning text

MOZAMBIQUE CHANNEL.
COMOROS (MAYOTTE).
DNC 02.
1. SURVEY OPERATIONS IN PROGRESS UNTIL 19 MAY
   BY M/V MARION DUFRESNE TOWING EQUIPMENT
   IN AREA BOUND BY
   12-15S 044-40E, 13-20S 044-40E,
   13-20S 046-20E, 12-15S 046-20E.
   WIDE BERTH REQUESTED.
2. CANCEL THIS MSG 20 MAY 19.

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.
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.

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

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

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

NAVAREA VII 267 of 2026 : (23 sep 26) 1. indian ocean - sw sector - offshore mayotte 2. chart san 1 3. rv…Surveys · 16.5 nm

Worldwide in the collected sources

56 survey operations listed in force · see all

Record snapshot 2026-10-02 20:39Z; 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.