Exercises

Hazardous operations 291000Z to 291400Z, 0600Z to 2030Z daily 30, 31 jul, 010600Z to 012030Z aug and 0600Z…

Sea of Marmara · HYDROLANT 2255/19

What this record establishes

Archived notice · 2019-08-05 15:00Z

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) · TURKEY 146/19 240707Z JUL 19.. Issued 2019-07-24 08:57Z. 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 Marmara. The map shows an area described by the warning; the listed coordinate is its representative center. Check the original wording for limits and qualifications.

Current notices and reporting history in the Sea of Marmara →

Activity windows · 2 in this warning

opens (UTC)	closes (UTC)	local	length
2019-07-29 10:00Z	2019-07-29 14:00Z	—	4 h
2019-08-01 06:00Z	2019-08-01 20:30Z	—	14 h 30

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

issued: 2019-07-24 08:57Z
status: Archived notice
self-cancels: 2019-08-05 15:00Z
authority: TURKEY 146/19 240707Z JUL 19.
issued by: TURKEY
sea: Sea of Marmara
position: 41.186, 29.107
source: NGA MSI broadcast-warn JSON (archive, frozen 2024-05) · first seen 2026-08-17 13:38Z

Original warning text

ISTANBUL BOGAZI.
DNC 10.
1. HAZARDOUS OPERATIONS 291000Z TO 291400Z,
   0600Z TO 2030Z DAILY 30, 31 JUL,
   010600Z TO 012030Z AUG AND 0600Z TO 1400Z DAILY
   02 AND 05 AUG IN AREA BOUND BY
   41-10.48N 029-05.88E, 41-11.18N 029-05.48E,
   41-11.78N 029-07.00E, 41-11.18N 029-07.40E.
2. CANCEL THIS MSG 051500Z AUG 19.

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.
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.
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

317 within 180 nm since 1999 · 4 in the last 12 months · 0 listed in force now

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

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

Drilling operations by fatih platform (imo 9503770Surveys · 76.3 nm

Worldwide in the collected sources

9 military exercises listed in force · see all

Record snapshot 2026-10-03 00:46Z; 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.