Exercises

Hazardous operations

Baltic Sea · HYDROLANT 524/10

What this record establishes

Archived notice · 2010-04-15 17:00Z

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) · LITHUANIA 10/10 261013Z MAR 10.. Issued 2010-03-26 14:11Z. 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
Baltic Sea. 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 Baltic Sea →

Activity windows · 3 in this warning

opens (UTC)closes (UTC)locallength
2010-03-31 06:00Z2010-03-31 16:00Z—10 h
2010-04-01 06:00Z2010-04-01 16:00Z—10 h
2010-04-02 06:00Z2010-04-02 16:00Z—10 h

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

issued
2010-03-26 14:11Z
status
Archived notice
self-cancels
2010-04-15 17:00Z
authority
LITHUANIA 10/10 261013Z MAR 10.
issued by
LITHUANIA
sea
Baltic Sea
position
55.503, 20.876
source
NGA MSI broadcast-warn JSON (archive, frozen 2024-05) · first seen 2026-08-17 13:38Z

Original warning text

BALTIC SEA.
LITHUANIA.
HAZARDOUS OPERATIONS.
1. HAZARDOUS OPERATIONS 0600Z TO 1600Z DAILY
   31 MAR THRU 02 APR, 07 THRU 09 APR AND
   13 THRU 15 APR IN AREA BOUND BY
   55-37.00N 020-45.89E, 55-35.50N 021-06.00E,
   55-31.00N 021-05.00E, 55-25.00N 020-59.89E,
   55-22.00N 020-45.89E, 55-25.00N 020-41.89E
   55-34.00N 020-41.89E.
2. CANCEL HYDROLANT 517/10(24).
3. CANCEL THIS MSG 151700Z APR.

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.
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.
Cancellation reference
A line that cancels an earlier warning by its number, such as CANCEL HYDROLANT 1085/12.
HYDROLANT
The U.S. long-range warning series for Atlantic waters outside NAVAREA IV, including the eastern Atlantic, the Mediterranean and adjoining seas.
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 · military exercises

313 within 180 nm since 2003 · 1 in the last 12 months · 0 listed in force now

03
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

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 11:47Z; 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.