Surveys

Survey operations are underway in the North Sea near Norway by the vessel Ramform Hyperion towing ten 2740-meter cables, requesting a three-mile berth.

North Sea · HYDROLANT 1496/26

What this record establishes

Cancelled notice · 2026-08-28 19:00Z

This notice disappeared from the issuing source's in-force list. No explicit recovery or all-clear is established by that removal.

Source and dates: NGA MSI in-force warnings (DailyMem*.txt). Issued 2026-08-03 13:54Z. First collected 2026-08-17 13:41Z; last seen in collection 2026-09-08 18:02Z. Collection dates record ingestion, not a new incident or a fresh field observation.
Location covered: North 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.

Current notices and reporting history in the North Sea →

issued: 2026-08-03 13:54Z
status: Cancelled notice
sea: North Sea
position: 59.305, 2.337
vessel: M/V RAMFORM HYPERION · 32 messages
nearest port: Haugesund · 90 nm
source: NGA MSI in-force warnings (DailyMem*.txt) · first seen 2026-08-17 13:41Z

Original warning text

NORTH SEA.
NORWAY.
1. SURVEY OPERATIONS IN PROGRESS UNTIL
   FURTHER NOTICE BY M/V RAMFORM HYPERION
   TOWING TEN 2740 METER LONG CABLES.
   IN AREA BOUND BY
   59-28.00N 001-50.40E, 59-42.60N 002-15.70E,
   59-29.00N 003-02.70E, 58-51.80N 002-21.70E,
   58-59.00N 001-52.80E.
   THREE MILE BERTH REQUESTED.
2. CANCEL HYDROLANT 1476/26.

Reading this warning

Survey operations: A research or survey vessel is mapping the seabed or water column, often while towing equipment.
Until further notice: The operation or danger has no scheduled end; the warning stays in force until a later message cancels it.
Towed array / streamer: Equipment towed a long way behind a vessel — sonar, a hydrophone cable, a sampling sled — invisible at the surface.
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.
Cancellation reference: A line that cancels an earlier warning by its number, such as CANCEL HYDROLANT 1085/12.
HYDROLANT: The U.S. long-range warning series for Atlantic waters outside NAVAREA IV, including the eastern Atlantic, the Mediterranean and adjoining seas.

All warning terms →

Collected reports in this area · survey operations

156 within 180 nm since 1999 · 6 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

54 survey operations listed in force · see all

Record snapshot 2026-09-29 20:13Z; 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.