Other

Underwater seamount, least depth 925 meters, reported in 78-36.91N 158-21.35W

Arctic Ocean · HYDROARC 23/10

What this record establishes

Archived notice · 2011-07-02 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) · NAVAREA XVII 8/10 012333Z JUL 10. Issued 2010-07-04 07:11Z. 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
Arctic Ocean. The parsed report position is 78.615, -158.356. 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 Arctic Ocean →

issued
2010-07-04 07:11Z
status
Archived notice
authority
NAVAREA XVII 8/10 012333Z JUL 10
NAVAREA
NAVAREA XVII · named as the source of this relay
sea
Arctic Ocean
position
78.615, -158.356
source
NGA MSI broadcast-warn JSON (archive, frozen 2024-05) · first seen 2026-08-17 13:38Z

Original warning text

ARCTIC.
1. UNDERWATER SEAMOUNT, LEAST DEPTH 925 METERS,
   REPORTED IN 78-36.91N 158-21.35W.
2. CANCEL AMSI 3/07.

Reading this warning

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.

All warning terms →

Collected reports in this area · other warnings

3 within 180 nm since 2007 · 0 in the last 12 months · 0 listed in force now

07
10

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 02:27Z; 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.