Underwater ordnance detonation 162200Z to 170300Z mar in area within three miles of 13-35.00N 144-55.00E
North Pacific Ocean · HYDROPAC 868/23
What this record establishes
Archived notice · 2023-03-17 04:00Z
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) · COMCOGARD FORCES MICRONESIA SECTOR GUAM 101/23 160600Z MAR 23.. Issued 2023-03-16 09:11Z. 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 parsed report position is 13.583, 144.917 with a 3.0 nm radius. It is a position in the source message, not a live location. Check the original wording for limits and qualifications.
Current notices and reporting history in the North Pacific Ocean →
Activity windows · 1 in this warning
| opens (UTC) | closes (UTC) | local | length |
|---|---|---|---|
| 2023-03-16 22:00Z | 2023-03-17 03:00Z | — | 5 h |
Parsed from the warning text; outside these windows the area is normally not active, but the warning stays in force until cancelled.
- issued
- 2023-03-16 09:11Z
- status
- Archived notice
- self-cancels
- 2023-03-17 04:00Z
- authority
- COMCOGARD FORCES MICRONESIA SECTOR GUAM 101/23 160600Z MAR 23.
- issued by
- COMCOGARD FORCES MICRONESIA SECTOR GUAM
- sea
- North Pacific Ocean
- position
- 13.583, 144.917 · r 3.0 nm
- source
- NGA MSI broadcast-warn JSON (archive, frozen 2024-05) · first seen 2026-08-17 13:38Z
Original warning text
WESTERN NORTH PACIFIC. GUAM. DNC 12. 1. UNDERWATER ORDNANCE DETONATION 162200Z TO 170300Z MAR IN AREA WITHIN THREE MILES OF 13-35.00N 144-55.00E. 2. CANCEL THIS MSG 170400Z MAR 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.
- Unexploded ordnance
- Bombs, shells, mines or torpedoes found on the seabed or washed up, and the operations to remove or destroy them.
- 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.
- Within a radius of
- A circular area — every position within a stated distance of a point.
- 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 · ordnance operations
20 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.
- Underwater ordnance detonation 2300Z to 0600Z daily 23 and 24 apr in 13-16.20N 144-22.80E2024-04-18
- Underwater ordnance detonation 302200Z to 310600Z mar in area within three miles of 13-35.97N 144-55.64E2023-03-23
- Underwater ordnance detonations 0001Z to 0400Z daily 11 and 12 nov vicinity 13-23N 144-35E2011-11-10
- Underwater ordnance detonations 210100Z to 210800Z sep vicinity 13-27.6N 144-38.5E2009-09-20
- Underwater ordnance detonations 100300Z to 100700Z apr vicinity 13-27-42N 144-38-30E2007-04-05
- Ordnance operations 0300Z to 0700Z daily 27 and 28 feb vicinity 13-27-24N 144-38-19E2007-02-22
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
- Uscg remote communication facility guam 13-29.00N 144-50.00E broadcast and communication services unreliableNav aids · 7.7 nm
- Guam hf NAVTEX station, V, 13-29.0N 144-50.0E, off airNav aids · 7.7 nm
- Due to tropical storm bavi: 1. the following port(s) are closed: a. rota island 14-08.35N 145-08.09EStorms · 38.4 nm
- Due to tropical storm, the following ports are closed, until further noticeStorms · 101.2 nm
Worldwide in the collected sources
0 ordnance operations listed in force · see all
Record snapshot 2026-10-03 19:51Z; source collection times vary.
Ordnance
Ordnance disposal, underwater detonations and unexploded ordnance. All current ordnance 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.