Surveys

Survey operations 21 may thru 18 nov by M/V nikolay trubyatchinskiy, M/V feydor kovrov kalas and M/V…

Sea of Okhotsk · HYDROPAC 1653/23

What this record establishes

Archived notice · 2023-08-07 09:43Z

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) · NAVAREA XIII 58/23 180903Z MAY 23.. Issued 2023-05-18 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
Sea of Okhotsk. 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 Sea of Okhotsk →

issued
2023-05-18 09:36Z
status
Archived notice
self-cancels
2023-11-19 00:01Z
authority
NAVAREA XIII 58/23 180903Z MAY 23.
NAVAREA
NAVAREA XIII · named as the source of this relay
sea
Sea of Okhotsk
position
51.357, 144.141
vessels
M/V FEYDOR KOVROV KALASM/V GEOPHIZICM/V NIKOLAY TRUBYATCHINSKIY · 8 messages
source
NGA MSI broadcast-warn JSON (archive, frozen 2024-05) · first seen 2026-08-17 13:38Z

Original warning text

SEA OF OKHOTSK.
RUSSIA.
DNC 24.
1. SURVEY OPERATIONS 21 MAY THRU 18 NOV
   BY M/V NIKOLAY TRUBYATCHINSKIY,
   M/V FEYDOR KOVROV KALAS AND
   M/V GEOPHIZIC IN AREA BOUND BY
   51-34.76N 143-33.71E, 51-40.53N 143-54.15E,
   51-29.38N 144-03.08E, 51-36.08N 144-26.78E,
   51-18.13N 144-39.70E, 51-07.31N 144-35.95E,
   51-05.05N 144-24.46E, 51-05.93N 144-11.36E,
   51-10.58N 143-49.25E.
   TWO MILE BERTH REQUESTED.
2. CANCEL THIS MSG 190001Z NOV 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.
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.
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

135 within 180 nm since 2000 · 5 in the last 12 months · 2 listed in force now

00
05
10
15
20
25
26

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

56 survey operations listed in force · see all

Record snapshot 2026-10-02 22:03Z; 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.