Surveys

Underwater operations 041400Z to 051355Z jun in area bound by 13-10N 144-43E, 13-10N 144-30E, 12-45N…

North Pacific Ocean · HYDROPAC 1819/15

What this record establishes

Archived notice · 2015-06-05 14:55Z

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) · COMCOGARD SECTOR GUAM 340/15 040537Z JUN 15.. Issued 2015-06-04 09:36Z. 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.

Current notices and reporting history in the North Pacific Ocean →

Activity windows · 1 in this warning

opens (UTC)closes (UTC)locallength
2015-06-04 14:00Z2015-06-05 13:55Z—23 h 55

Parsed from the warning text; outside these windows the area is normally not active, but the warning stays in force until cancelled.

issued
2015-06-04 09:36Z
status
Archived notice
self-cancels
2015-06-05 14:55Z
authority
COMCOGARD SECTOR GUAM 340/15 040537Z JUN 15.
issued by
COMCOGARD SECTOR GUAM
sea
North Pacific Ocean
position
11.743, 144.013
source
NGA MSI broadcast-warn JSON (archive, frozen 2024-05) · first seen 2026-08-17 13:38Z

Original warning text

WESTERN NORTH PACIFIC.
MARIANA ISLANDS.
DNC 12.
1. UNDERWATER OPERATIONS 041400Z TO 051355Z JUN
   IN AREA BOUND BY
   13-10N 144-43E, 13-10N 144-30E,
   12-45N 144-30E, 11-45N 143-00E,
   11-00N 143-00E, 11-00N 144-45E.
2. CANCEL THIS MSG 051455Z JUN 15.

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.
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.

All warning terms →

Collected reports in this area · survey operations

13 within 180 nm since 2002 · 0 in the last 12 months · 0 listed in force now

02
05
10
15
20
23

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

J
F
M
A
M
J
J
A
S
O
N
D

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

Worldwide in the collected sources

55 survey operations listed in force · see all

Record snapshot 2026-10-02 08:53Z; 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.