Hydrographic operations: a. 140001Z to 142100Z mar in area bound by 36-04N 155-00E, 35-42N 160-00E, 35-44N…
North Pacific Ocean · HYDROPAC 436/00
What this record establishes
Archived notice · 2000-03-13 10:30Z
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) · CTG 72.4 130001Z MAR 00. Issued 2000-03-13 08:05Z. 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
- North Pacific Ocean. 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 North Pacific Ocean →
Activity windows · 2 in this warning
| opens (UTC) | closes (UTC) | local | length |
|---|---|---|---|
| 2000-03-14 00:01Z | 2000-03-14 21:00Z | — | 20 h 59 |
| 2000-03-15 00:01Z | 2000-03-15 21:00Z | — | 20 h 59 |
Parsed from the warning text; outside these windows the area is normally not active, but the warning stays in force until cancelled.
- issued
- 2000-03-13 08:05Z
- status
- Archived notice
- self-cancels
- 2000-03-15 22:00Z
- authority
- CTG 72.4 130001Z MAR 00
- issued by
- CTG
- sea
- North Pacific Ocean
- position
- 36.073, 146.449
- source
- NGA MSI broadcast-warn JSON (archive, frozen 2024-05) · first seen 2026-08-17 13:38Z
Original warning text
1. HYDROGRAPHIC OPERATIONS:
A. 140001Z TO 142100Z MAR IN AREA BOUND BY
36-04N 155-00E, 35-42N 160-00E,
35-44N 155-00E, 35-22N 160-00E.
B. 150001Z TO 152100Z MAR IN AREA BOUND BY
36-13N 145-00E, 36-15N 150-00E,
35-53N 145-00E, 33-55N 150-00E.
2. CANCEL THIS MSG 152200Z MAR.
Reading this warning
- 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.
- 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.
- CANCEL THIS MSG
- The warning's own expiry: a line telling the reader when the message cancels itself.
Collected reports in this area · other warnings
3 within 180 nm since 1999 · 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.
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
20 other warnings listed in force · see all
Record snapshot 2026-09-25 16:16Z; source collection times vary.
Other
Everything the classifier did not place elsewhere. All current other warnings →
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.