Oceanographic operations 10 thru 20 apr by M/V poseidon along trackline joining 30-00N 024-00W, 33-00N…
North Atlantic Ocean · HYDROLANT 1223/00
What this record establishes
Archived notice · 2000-04-08 08:55Z
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 II 91/00 070810Z APR 00. Issued 2000-04-07 09:25Z. 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
- North Atlantic Ocean. The map shows the reported line or operation extent; it is not a vessel track. Check the original wording for limits and qualifications.
Related notices and cancellation links
Current notices and reporting history in the North Atlantic Ocean →
- issued
- 2000-04-07 09:25Z
- status
- Archived notice
- authority
- NAVAREA II 91/00 070810Z APR 00
- NAVAREA
- NAVAREA II · named as the source of this relay
- sea
- North Atlantic Ocean
- position
- 33.438, -21.893
- vessel
- M/V POSEIDON · 64 messages
- source
- NGA MSI broadcast-warn JSON (archive, frozen 2024-05) · first seen 2026-08-17 13:38Z
Original warning text
1. OCEANOGRAPHIC OPERATIONS 10 THRU 20 APR BY M/V POSEIDON ALONG TRACKLINE JOINING 30-00N 024-00W, 33-00N 022-00W, 37-00N 020-00W. 2. CANCEL HYDROLANT 1042/00.
Reading this warning
- Track line joining
- Introduces a route through a series of positions — a cable route, a tow's track or a survey line.
- 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
9 within 180 nm since 2000 · 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.
- Survey operations from 26 may thru 23 jun by sarmiento de gamboa in area bound by 20-02N 021-02W, 25-00N…2018-05-25
- Hydrographic survey 03 thru 10 dec by M/V d. carlos I in area bound by 32-09.78N 021-54.43W, 32-11.59N…2012-12-02
- Underwater operations in progress until further notice by M/V poseidon with submersible vicinity of 31-00N…2010-09-08
- Oceanographic operations 17 oct thru 11 nov by M/V hesperides along trackline joining 37-00.0N 010-02.7W,…2009-10-16
- Underwater operations in progress until 23 apr by M/V poseidon in area bound by 28-00N 020-00W, 30-00N…2007-04-07
- Underwater operations 05 thru 23 apr by M/V poseidon in area bound by 28-00N 020-00W, 30-00N 022-00W, 40-00N…2007-04-04
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
55 survey operations listed in force · see all
Record snapshot 2026-10-02 04:35Z; 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.