Hazardous operations
North Atlantic Ocean · HYDROLANT 232/17
What this record establishes
Archived notice · 2017-01-23 16:37Z
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 23/17 222025Z JAN 17.. Issued 2017-01-22 20:29Z. 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
- Hazardous operationslater cancellation notice
Current notices and reporting history in the North Atlantic Ocean →
Activity windows · 31 in this warning
| opens (UTC) | closes (UTC) | local | length |
|---|---|---|---|
| 2017-01-28 00:01Z | 2017-01-28 02:00Z | — | 1 h 59 |
| 2017-01-29 00:01Z | 2017-01-29 02:00Z | — | 1 h 59 |
| 2017-01-30 00:01Z | 2017-01-30 02:00Z | — | 1 h 59 |
| 2017-01-31 00:01Z | 2017-01-31 02:00Z | — | 1 h 59 |
| 2017-02-01 00:01Z | 2017-02-01 02:00Z | — | 1 h 59 |
| 2017-02-02 00:01Z | 2017-02-02 02:00Z | — | 1 h 59 |
| 2017-02-03 00:01Z | 2017-02-03 02:00Z | — | 1 h 59 |
| 2017-02-04 00:01Z | 2017-02-04 02:00Z | — | 1 h 59 |
| … 23 more | |||
Parsed from the warning text; outside these windows the area is normally not active, but the warning stays in force until cancelled.
- issued
- 2017-01-22 20:29Z
- status
- Archived notice
- self-cancels
- 2017-02-27 03:00Z
- authority
- NAVAREA V 23/17 222025Z JAN 17.
- NAVAREA
- NAVAREA V · named as the source of this relay
- sea
- North Atlantic Ocean
- position
- 5.008, -45.750
- 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 0001Z TO 0200Z
DAILY 28 JAN THRU 27 FEB
IN AREAS BOUND BY:
A. 05-03N 047-28W, 05-05N 047-28W,
05-19N 048-27W, 05-17N 048-25W.
B. 04-44N 045-08W, 04-49N 046-23W,
05-16N 046-22W, 05-12N 045-07W.
C. 04-12N 039-05W, 05-14N 040-32W,
04-35N 040-34W, 04-01N 039-02W.
2. CANCEL THIS MSG 270300Z FEB 17.
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.
- 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
81 within 180 nm since 2000 · 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 142025Z feb to 140005Z mar in areas bound by: a. 05-16N 047-26W, 04-44N 047-27W, 04-47N…2017-02-11
- Hazardous operations 140300Z to 150300Z feb in area bound by 05-16N 047-26W, 04-44N 047-27W, 04-47N 048-26W,…2017-02-09
- Hazardous operations2016-12-16
- Hazardous operations2016-12-15
- Hazardous operations2016-09-30
- Hazardous operations2016-08-19
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 02:32Z; 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.