Surveys

Underwater operations in progress until 31 jan 22 by M/V seven borealis and M/V siem spearfish along…

Caribbean Sea · NAVAREA IV 1074/21

What this record establishes

Archived notice · 2021-12-03 15:55Z

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) · TRINIDAD AND TOBAGO 59/21 301250Z NOV 21.. Issued 2021-11-30 15:29Z. 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: Caribbean Sea. The map shows the reported line or operation extent; it is not a vessel track. Check the original wording for limits and qualifications.

Current notices and reporting history in the Caribbean Sea →

issued: 2021-11-30 15:29Z
status: Archived notice
authority: TRINIDAD AND TOBAGO 59/21 301250Z NOV 21.
NAVAREA: NAVAREA IV
issued by: TRINIDAD AND TOBAGO
sea: Caribbean Sea
position: 11.335, -61.137
vessels: M/V SEVEN BOREALIS · 7 messages M/V SIEM SPEARFISH · 7 messages
source: NGA MSI broadcast-warn JSON (archive, frozen 2024-05) · first seen 2026-08-17 13:38Z

Original warning text

EASTERN CARIBBEAN SEA.
TOBAGO.
1. UNDERWATER OPERATIONS IN PROGRESS
   UNTIL 31 JAN 22 BY M/V SEVEN BOREALIS AND
   M/V SIEM SPEARFISH ALONG TRACKLINE JOINING
   11-13.74N 061-31.38W, 11-15.00N 061-23.02W,
   11-16.19N 061-14.10W, 11-17.79N 061-09.07W,
   11-24.16N 060-57.79W, 11-30.51N 060-46.49W.
   500 METER BERTH REQUESTED.
2. CANCEL THIS MSG 01 FEB 22.

Reading this warning

Underwater operations: Divers or remotely operated vehicles are working below a vessel that cannot easily move out of the way.
Track line joining: Introduces a route through a series of positions — a cable route, a tow's track or a survey line.
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.
Wide berth requested: Keep well clear — or, when a distance is given ("TWO MILE BERTH REQUESTED"), at least that far away.
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 · survey operations

180 within 180 nm since 2002 · 8 in the last 12 months · 1 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

Trinidad and tobagoNav aids · 20.5 nm
Trinidad and tobagoNav aids · 50.7 nm
Trinidad and tobagoNav aids · 52.8 nm
Trinidad and tobagoWrecks · 57.6 nm
Faro punta mejillones light 10-42.20N 062-08.40W discontinuedNav aids · 70.2 nm
Trinidad and tobagoNav aids · 72.4 nm
GrenadinesWrecks · 77.4 nm
Trinidad and tobagoNav aids · 81.9 nm
Trinidad and tobagoSurveys · 89.3 nm
Trinidad and tobagoCable ops · 89.5 nm
Isla testigo grande light 11-22.90N 063-07.20W unlitNav aids · 116.7 nm

Worldwide in the collected sources

56 survey operations listed in force · see all

Record snapshot 2026-10-04 04:49Z; source collection times vary.

Surveys

Hydrographic and scientific survey vessels, often towing long arrays. All current survey operations →

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.