Survey operations in progress until further notice by M/V amazon warrior towing 12 8000 meter long cables,…
Norwegian Sea · HYDROLANT 811/23
What this record establishes
Archived notice · 2023-06-25 14:07Z
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 I 55/23 150204Z APR 23.. Issued 2023-04-15 05:05Z. 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
- Survey operations in progress until further notice by M/V amazon warrior towing 12 8000 meter long cables,…cancelled by this notice
- Cancel HYDROLANT 811/23, 1346/23 and this msg, operations completedlater cancellation notice
Current notices and reporting history in the Norwegian Sea →
- issued
- 2023-04-15 05:05Z
- status
- Archived notice
- authority
- NAVAREA I 55/23 150204Z APR 23.
- NAVAREA
- NAVAREA I · named as the source of this relay
- sea
- Norwegian Sea
- position
- 62.096, 2.779
- vessels
- M/V AMAZON WARRIOR · 67 messagesM/V SHANNON · 5 messagesM/V VOS APOLLO · 25 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 20, DNC 21.
1. SURVEY OPERATIONS IN PROGRESS UNTIL FURTHER
NOTICE BY M/V AMAZON WARRIOR TOWING 12 8000
METER LONG CABLES, M/V VOS APOLLO AND
M/V SHANNON IN AREA BOUND BY
62-29.00N 002-43.00E, 62-29.00N 004-28.00E,
62-14.00N 004-48.00E, 61-48.00N 004-36.00E,
61-47.00N 000-36.00E, 62-17.00N 000-33.00E,
62-19.00N 002-43.00E.
2. CANCEL HYDROLANT 806/23.
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.
- 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.
- 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.
Collected reports in this area · survey operations
101 within 180 nm since 2003 · 4 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.
- Survey operations in progress until further notice by M/V ramform atlas towing 12 7050 meter long cables in…2026-09-06
- Survey operations in progress until further notice by M/V amazon conqueror towing eight one mile long cables…2026-08-15
- Survey operations in progress until further notice by M/V ramform hyperion towing ten 2740 meter long cables2026-08-03
- Survey operations in progress until further notice by M/V ramform atlas towing 17 3600 meter long cables in…2026-07-03
- Survey operations 17 jul until further notice by M/V ramform vanguard towing 17 4200 meter long cables in…2023-07-16
- Survey operations in progress until further notice by M/V sw amundsen towing 2800 meter long cable in area…2023-06-17
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 15:49Z; 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.