Other

Hydrographic operations in progress until 270001Z jun in area bound by 38-39N 144-21E, 38-40N 145-38E,…

North Pacific Ocean · HYDROPAC 559/99

What this record establishes

Archived notice · 1999-06-25 12:44Z

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 SEVEN TWO PT FOUR 240001Z JUN 99. Issued 1999-06-25 01:20Z. 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 →

issued
1999-06-25 01:20Z
status
Archived notice
self-cancels
1999-06-27 01:01Z
authority
CTG SEVEN TWO PT FOUR 240001Z JUN 99
issued by
CTG SEVEN TWO PT FOUR
sea
North Pacific Ocean
position
38.034, 145.003
source
NGA MSI broadcast-warn JSON (archive, frozen 2024-05) · first seen 2026-08-17 13:38Z

Original warning text

1. HYDROGRAPHIC OPERATIONS IN PROGRESS UNTIL
   270001Z JUN IN AREA BOUND BY
   38-39N 144-21E, 38-40N 145-38E,
   37-28N 145-48E, 37-26N 144-14E.
2. CANCEL THIS MSG 270101Z JUN.

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.

All warning terms →

Collected reports in this area · other warnings

5 within 180 nm since 1999 · 0 in the last 12 months · 0 listed in force now

99
00
01

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

No other collected notice is currently listed in force within this radius. This does not establish safe conditions.

Worldwide in the collected sources

21 other warnings listed in force · see all

Record snapshot 2026-09-25 01:45Z; 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.