Survey operations 16 may thru 24 jun by M/V ramform hyperion towing 14 six mile long cables, M/V thor omega…
Norwegian Sea · HYDROARC 79/23
What this record establishes
Archived notice · 2023-06-25 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 XIX 54/23 112140Z MAY 23.. Issued 2023-05-11 22:28Z. 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
- Norwegian 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 Norwegian Sea →
- issued
- 2023-05-11 22:28Z
- status
- Archived notice
- self-cancels
- 2023-06-25 00:01Z
- authority
- NAVAREA XIX 54/23 112140Z MAY 23.
- NAVAREA
- NAVAREA XIX · named as the source of this relay
- sea
- Norwegian Sea
- position
- 71.665, 19.889
- vessels
- M/V AAS PROVIDER · 2 messagesM/V RAMFORM HYPERION · 32 messagesM/V THOR OMEGA · 5 messages
- source
- NGA MSI broadcast-warn JSON (archive, frozen 2024-05) · first seen 2026-08-17 13:38Z
Original warning text
NORWEGIAN SEA. NORWAY. DNC 22. 1. SURVEY OPERATIONS 16 MAY THRU 24 JUN BY M/V RAMFORM HYPERION TOWING 14 SIX MILE LONG CABLES, M/V THOR OMEGA AND M/V AAS PROVIDER IN AREA BOUND BY 72-03.2N 018-28.2E, 71-07.9N 019-05.8E, 71-16.1N 021-16.1E, 72-11.7N 020-43.8E, 72-03.2N 018-28.2E. SEVEN MILE BERTH REQUESTED. 2. CANCEL HYDROARC 151/22. 3. CANCEL THIS MSG 250001Z 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.
- 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.
- HYDROARC
- The U.S. long-range warning series for the Arctic Ocean.
- 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.
Collected reports in this area · survey operations
23 within 180 nm since 2012 · 0 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.
- Underwater operations 172100Z to 202100Z sep in area bound by 74-03.00N 025-42.50E, 74-03.00N 023-54.50E,…2023-09-13
- Survey operations in progress until further notice by M/V ramford hyperion towing 12 4050 meter long cables…2022-07-11
- Survey operations 05 jul until further notice by M/V ramform vanguard towing 12 4050 meter long cables in…2022-07-04
- Survey operations in progress until 30 sep by M/V ramform tethys towing 16 10000 meter long cables in area…2020-07-05
- Survey operations in progress until 31 jul by M/V ramform tethys towing 14 4000 meter long cables in area…2020-06-03
- Underwater operations 30 sep thru 06 oct by M/V pourquoi pas towing 1000 meter long cable in area bound by…2019-09-29
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 2026-10-03 04:28Z; 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.