Underwater operations 2300Z to 0600Z daily 10 thru 12 apr in 13-16.20N 144-22.80E
Philippine Sea · HYDROPAC 1139/23
What this record establishes
Archived notice · 2023-04-13 07:00Z
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 136/23 050502Z APR 23.. Issued 2023-04-05 12:03Z. 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
- Philippine Sea. The parsed report position is 13.270, 144.380. 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 Philippine Sea →
Activity windows · 3 in this warning
| opens (UTC) | closes (UTC) | local | length |
|---|---|---|---|
| 2023-04-10 23:00Z | 2023-04-11 06:00Z | — | 7 h |
| 2023-04-11 23:00Z | 2023-04-12 06:00Z | — | 7 h |
| 2023-04-12 23:00Z | 2023-04-13 06:00Z | — | 7 h |
Parsed from the warning text; outside these windows the area is normally not active, but the warning stays in force until cancelled.
- issued
- 2023-04-05 12:03Z
- status
- Archived notice
- self-cancels
- 2023-04-13 07:00Z
- authority
- COMCOGARD FORCES MICRONESIA SECTOR GUAM 136/23 050502Z APR 23.
- issued by
- COMCOGARD FORCES MICRONESIA SECTOR GUAM
- sea
- Philippine Sea
- position
- 13.270, 144.380
- 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 OPERATIONS 2300Z TO 0600Z DAILY 10 THRU 12 APR IN 13-16.20N 144-22.80E. ONE MILE BERTH REQUESTED. 2. CANCEL THIS MSG 130700Z APR 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.
- Underwater operations
- Divers or remotely operated vehicles are working below a vessel that cannot easily move out of the way.
- 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.
- 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
19 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.
- Underwater operations in progress until 161359Z feb by M/V thompson in area bound by 15-15.46N 146-05.22E,…2025-02-05
- Underwater operations 2200Z to 0800Z daily 12 and 14 jun in area bound by 13-27.75N 144-37.58E, 13-27.22N…2023-06-09
- Underwater operations 2200Z to 0800Z daily 12 thru 18 may in 13-29.50N 144-40.67E2023-05-03
- Survey operations 2100Z to 0800Z daily 09, 11 and 13 apr in 13-16.20N 144-22.80E2023-04-05
- Underwater operations 2200Z to 0600Z daily 03 thru 05 apr in 13-16.20N 144-22.80E2023-03-30
- Survey operations in progress until 030800Z nov by M/V fugro supporter in: a. 13-44.66N 144-40.18E2022-10-25
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
- Hazardous operations 252000Z to 261000Z sep in area bound by 13-32.00N 144-04.00E, 13-32.00N 144-27.00E,…Exercises · 7.5 nm
- Uscg remote communication facility guam 13-29.00N 144-50.00E broadcast and communication services unreliableNav aids · 29.4 nm
- Guam hf NAVTEX station, V, 13-29.0N 144-50.0E, off airNav aids · 29.4 nm
- Due to tropical storm bavi: 1. the following port(s) are closed: a. rota island 14-08.35N 145-08.09EStorms · 70.5 nm
- Hazardous operations 2200Z to 1000Z daily 28 thru 30 sep in area bound by 12-40.00N 144-45.00E, 11-00.00N…Exercises · 96.9 nm
- Hazardous operations 292300Z to 300900Z sep and 302300Z sep to 010700Z oct in area bound by 12-40.00N…Exercises · 96.9 nm
Worldwide in the collected sources
55 survey operations listed in force · see all
Record snapshot 2026-10-02 08:18Z; 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.