Surveys

Underwater operations 0800Z to 2000Z daily 19 and 20 jul by M/V sd northern river in area within ten miles…

Inner Seas off the West Coast of Scotland · HYDROLANT 2238/17

What this record establishes

Archived notice · 2017-07-20 21:00Z

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) · WZ 854/17 182330Z JUL 17.. Issued 2017-07-18 23:44Z. 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: Inner Seas off the West Coast of Scotland. The parsed report position is 55.483, -5.400 with a 10.0 nm radius. It is a position in the source message, not a live location. Check the original wording for limits and qualifications.

Current notices and reporting history in the Inner Seas off the West Coast of Scotland →

issued: 2017-07-18 23:44Z
status: Archived notice
self-cancels: 2017-07-20 21:00Z
authority: WZ 854/17 182330Z JUL 17.
issued by: WZ
sea: Inner Seas off the West Coast of Scotland
position: 55.483, -5.400 · r 10.0 nm
vessel: M/V SD NORTHERN RIVER · 14 messages
source: NGA MSI broadcast-warn JSON (archive, frozen 2024-05) · first seen 2026-08-17 13:38Z

Original warning text

NORTH CHANNEL.
SCOTLAND-SOUTHWEST COAST.
DNC 20.
1. UNDERWATER OPERATIONS 0800Z TO 2000Z
   DAILY 19 AND 20 JUL BY M/V SD NORTHERN RIVER
   IN AREA WITHIN TEN MILES OF 55-29N 005-24W.
   WIDE BERTH REQUESTED.
2. CANCEL THIS MSG 202100Z JUL 17.

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.
Underwater operations: Divers or remotely operated vehicles are working below a vessel that cannot easily move out of the way.
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.
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

265 within 180 nm since 1999 · 1 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.

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

56 survey operations listed in force · see all

Record snapshot 2026-10-01 20:12Z; 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.