Hazardous operations
North Atlantic Ocean · HYDROLANT 875/15
What this record establishes
Archived notice · 2015-04-14 16:54Z
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 346/15 110014Z APR 15.. Issued 2015-04-13 16:42Z. 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 operationscancelled by this notice
- Distress signal received from aircraft in 21-13N 059-57Wcancelled by this notice
- 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 |
|---|---|---|---|
| 2015-04-15 18:30Z | 2015-04-15 22:37Z | — | 4 h 07 |
| 2015-04-16 18:30Z | 2015-04-16 22:37Z | — | 4 h 07 |
| 2015-04-17 18:30Z | 2015-04-17 22:37Z | — | 4 h 07 |
| 2015-04-18 18:30Z | 2015-04-18 22:37Z | — | 4 h 07 |
| 2015-04-19 18:30Z | 2015-04-19 22:37Z | — | 4 h 07 |
| 2015-04-20 18:30Z | 2015-04-20 22:37Z | — | 4 h 07 |
| 2015-04-21 18:30Z | 2015-04-21 22:37Z | — | 4 h 07 |
| 2015-04-22 18:30Z | 2015-04-22 22:37Z | — | 4 h 07 |
| … 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
- 2015-04-13 16:42Z
- status
- Archived notice
- self-cancels
- 2015-05-15 23:37Z
- authority
- NAVAREA V N 346/15 110014Z APR 15.
- NAVAREA
- NAVAREA V · named as the source of this relay
- issued by
- NAVAREA V N
- sea
- North Atlantic Ocean
- position
- 5.184, -47.342
- 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 1830Z TO 2237Z DAILY
15 APR THRU 15 MAY IN AREAS BOUND BY:
A. 05-15N 045-40W, 05-00N 045-40W,
05-03N 047-25W, 05-18N 047-24W.
B. 05-27N 047-32W, 04-58N 047-33W,
04-58N 048-33W, 05-28N 048-33W.
2. CANCEL HYDROLANT 855/15, 860/15(25)
3. CANCEL THIS MSG 152337Z MAY 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.
- 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.
Collected reports in this area · military exercises
57 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 operations2017-01-22
- Hazardous operations2017-01-22
- Hazardous operations2016-12-16
- Hazardous operations2016-12-15
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 13:12Z; 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.