Missiles

Hazardous operations, space debris 2000Z to 2332Z daily 30 jul thru 29 aug in areas bound by: a. 05-37N…

North Atlantic Ocean · HYDROLANT 1937/21

What this record establishes

Archived notice · 2021-07-25 03:43Z

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 221322Z JUL 21.. Issued 2021-07-25 03:22Z. 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

These reports were linked by category and sea, with positions within 30 nautical miles and issue dates within 30 days of another report's recorded in-force span. Links can extend through other members, so the full group can cover a larger area or period. Proximity does not confirm that they describe one incident.

  1. HYDROLANT 1917/212021-07-22 · Archived notice
  2. HYDROLANT 1918/212021-07-22 · Archived notice
  3. HYDROLANT 1937/21 · this notice2021-07-25 · Archived notice
  4. HYDROLANT 1938/212021-07-25 · Archived notice
Compare all 4 notices, changes and original texts →

Current notices and reporting history in the North Atlantic Ocean →

Activity windows · 62 in this warning

opens (UTC)closes (UTC)locallength
2021-07-30 20:00Z2021-07-30 23:32Z—3 h 32
2021-07-30 20:58Z2021-07-31 00:16Z—3 h 18
2021-07-31 20:00Z2021-07-31 23:32Z—3 h 32
2021-07-31 20:58Z2021-08-01 00:16Z—3 h 18
2021-08-01 20:00Z2021-08-01 23:32Z—3 h 32
2021-08-01 20:58Z2021-08-02 00:16Z—3 h 18
2021-08-02 20:00Z2021-08-02 23:32Z—3 h 32
2021-08-02 20:58Z2021-08-03 00:16Z—3 h 18
… 54 more

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

issued
2021-07-25 03:22Z
status
Archived notice
self-cancels
2021-08-30 00:32Z
authority
FRENCH GUIANA 221322Z JUL 21.
issued by
FRENCH GUIANA
sea
North Atlantic Ocean
position
1.588, -10.594
source
NGA MSI broadcast-warn JSON (archive, frozen 2024-05) · first seen 2026-08-17 13:38Z

Original warning text

EASTERN NORTH ATLANTIC.
DNC 01.
1. HAZARDOUS OPERATIONS, SPACE DEBRIS
   2000Z TO 2332Z DAILY 30 JUL THRU 29 AUG
   IN AREAS BOUND BY:
   A. 05-37N 048-21W, 05-38N 047-22W,
      05-07N 047-22W, 05-05N 048-20W.
   B. 05-23N 047-12W, 05-21N 045-27W,
      05-06N 045-27W, 05-07N 047-12W.
2. HAZARDOUS OPERATIONS, SPACE DEBRIS
   2058Z TO 0016Z DAILY 30 JUL THRU 29 AUG
   IN AREA BOUND BY
   03-13N 016-41W, 01-28N 001-40W,
   00-18S 001-53W, 01-26N 016-53W.
2. CANCEL HYDROLANT 1917/21, 1918/21.
3. CANCEL THIS MSG 300032Z AUG 21.

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.
Space debris
An area where parts of a spacecraft or rocket stage are expected to come down at sea, from a launch or a planned re-entry.
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 · missile & rocket hazards

56 within 180 nm since 2010 · 0 in the last 12 months · 0 listed in force now

10
15
20
23

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

4 missile & rocket hazards listed in force · see all

Record snapshot 2026-10-02 06:19Z; source collection times vary.

Missiles

Missile firings, rocket launches and space debris re-entry areas. All current missile & rocket hazards →

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.