Surveys

Survey operations 2100Z to 0800Z daily 09, 11 and 13 apr in 13-16.20N 144-22.80E

Philippine Sea · HYDROPAC 1138/23

What this record establishes

Archived notice · 2023-04-14 09:00Z

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 131/23 050502Z APR 23.. Issued 2023-04-05 12:00Z. 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 →

issued: 2023-04-05 12:00Z
status: Archived notice
self-cancels: 2023-04-14 09:00Z
authority: COMCOGARD FORCES MICRONESIA SECTOR GUAM 131/23 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. SURVEY OPERATIONS 2100Z TO 0800Z DAILY
   09, 11 AND 13 APR IN 13-16.20N 144-22.80E.
   WIDE BERTH REQUESTED.
2. CANCEL THIS MSG 140900Z 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.
Survey operations: A research or survey vessel is mapping the seabed or water column, often while towing equipment.
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.

All warning terms →

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.

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 292300Z to 300900Z sep and 302300Z sep to 010700Z oct in area bound by 12-40.00N…Exercises · 96.9 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

Worldwide in the collected sources

55 survey operations listed in force · see all

Record snapshot 2026-09-25 18:54Z; 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.