Exercises

Hazardous operations

North Atlantic Ocean · HYDROLANT 1683/15

What this record establishes

Archived notice · 2015-07-10 09:40Z

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 V N 638/15 100030Z JUL 15.. Issued 2015-07-10 00:50Z. 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 Atlantic 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 Atlantic Ocean →

Activity windows · 1 in this warning

opens (UTC)closes (UTC)locallength
2015-07-15 20:20Z2015-08-15 23:45Z—747 h 25

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

issued
2015-07-10 00:50Z
status
Archived notice
self-cancels
2015-08-16 00:45Z
authority
NAVAREA V N 638/15 100030Z JUL 15.
NAVAREA
NAVAREA V · named as the source of this relay
issued by
NAVAREA V N
sea
North Atlantic Ocean
position
5.947, -45.776
source
NGA MSI broadcast-warn JSON (archive, frozen 2024-05) · first seen 2026-08-17 13:38Z

Original warning text

WESTERN NORTH ATLANTIC.
BRAZIL-NORTH COAST.
HAZARDOUS OPERATIONS.
DNC 01.
1. HAZARDOUS OPERATIONS 152020Z JUL TO 152345Z AUG
   IN AREAS BOUND BY:
   A. 06-22.30N 047-36.02W, 05-52.10N 047-31.08W,
      05-42.40N 048-30.99W, 06-12.60N 048-35.97W,
   B. 06-08.78N 044-54.38W, 05-52.36N 044-53.23W,
      05-44.86N 046-38.72W, 06-01.28N 046-39.92W.
2. CANCEL THIS MSG 160045Z AUG 15.

Reading this warning

Hazardous operations
NGA's heading for activities that make an area dangerous — most often rocket launches, space debris and weapons firings, and some open-ended danger areas.
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.
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 · military exercises

80 within 180 nm since 2000 · 0 in the last 12 months · 0 listed in force now

00
05
10
15
17

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

9 military exercises listed in force · see all

Record snapshot 2026-10-03 02:33Z; source collection times vary.

Exercises

Gunnery, firing and naval exercise areas. All current military exercises →

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.