Hazardous operations 1638Z to 1742Z daily 06 thru 31 mar in area bound by 05-29N 050-14W, 05-29N 049-36W,…
North Atlantic Ocean · HYDROLANT 711/18
What this record establishes
Archived notice · 2018-03-12 15:38Z
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) · FRENCH GUIANA 201051Z FEB 18.. Issued 2018-03-01 10:20Z. 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
- Cancel HYDROLANT 711/18 and this msg, operations completedlater cancellation notice
Current notices and reporting history in the North Atlantic Ocean →
Activity windows · 52 in this warning
| opens (UTC) | closes (UTC) | local | length |
|---|---|---|---|
| 2018-03-06 15:30Z | 2018-03-06 17:42Z | — | 2 h 12 |
| 2018-03-06 16:38Z | 2018-03-06 17:42Z | — | 1 h 04 |
| 2018-03-07 15:30Z | 2018-03-07 17:42Z | — | 2 h 12 |
| 2018-03-07 16:38Z | 2018-03-07 17:42Z | — | 1 h 04 |
| 2018-03-08 15:30Z | 2018-03-08 17:42Z | — | 2 h 12 |
| 2018-03-08 16:38Z | 2018-03-08 17:42Z | — | 1 h 04 |
| 2018-03-09 15:30Z | 2018-03-09 17:42Z | — | 2 h 12 |
| 2018-03-09 16:38Z | 2018-03-09 17:42Z | — | 1 h 04 |
| … 44 more | |||
Parsed from the warning text; outside these windows the area is normally not active, but the warning stays in force until cancelled.
- issued
- 2018-03-01 10:20Z
- status
- Archived notice
- self-cancels
- 2018-03-31 18:42Z
- authority
- FRENCH GUIANA 201051Z FEB 18.
- issued by
- FRENCH GUIANA
- sea
- North Atlantic Ocean
- position
- 5.133, -40.392
- 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.
DNC 01.
1. HAZARDOUS OPERATIONS 1638Z TO 1742Z
DAILY 06 THRU 31 MAR IN AREA BOUND BY
05-29N 050-14W, 05-29N 049-36W,
05-15N 049-36W, 05-14N 050-13W.
2. HAZARDOUS OPERATIONS 1530Z TO 1742Z
DAILY 06 THRU 31 MAR IN AREAS BOUND BY:
A. 05-30N 045-21W, 05-29N 044-05W,
05-02N 044-05W, 05-03N 045-21W.
B. 05-28N 041-08W, 05-26N 039-38W,
04-48N 039-39W, 04-50N 041-09W.
3. CANCEL THIS MSG 311842Z MAR 18.
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.
- 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.
- 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.
Collected reports in this area · military exercises
23 within 180 nm since 1999 · 0 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.
- Hazardous operations 0003Z to 0207Z daily 28 jan thru 27 feb in areas bound by: a. 05-03N 049-32W, 05-05N…2017-01-27
- Hazardous operations2016-12-13
- Hazardous operations2016-12-12
- Hazardous operations2016-12-12
- Hazardous operations2016-12-07
- Hazardous operations 1500Z to 2325Z daily 29 oct thru 29 nov in areas: a. within 12 miles of trackline…2009-10-24
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
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 03:09Z; 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.