Surveys

Survey operations in progress until 10 jul by M/V pgs apollo towing 12 five mile long cables in area bound…

Timor Sea · HYDROPAC 2383/18

What this record establishes

Archived notice · 2018-07-08 12:17Z

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 XI 325/18 281204Z JUN 18.. Issued 2018-06-28 13:34Z. 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
Timor Sea. 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

Current notices and reporting history in the Timor Sea →

issued
2018-06-28 13:34Z
status
Archived notice
authority
NAVAREA XI 325/18 281204Z JUN 18.
NAVAREA
NAVAREA XI · named as the source of this relay
sea
Timor Sea
position
-10.375, 124.583
vessel
M/V PGS APOLLO · 81 messages
source
NGA MSI broadcast-warn JSON (archive, frozen 2024-05) · first seen 2026-08-17 13:38Z

Original warning text

TIMOR SEA.
INDONESIA.
DNC 04.
1. SURVEY OPERATIONS IN PROGRESS UNTIL 10 JUL
   BY M/V PGS APOLLO TOWING 12 FIVE MILE
   LONG CABLES IN AREA BOUND BY
   10-40S 123-40E, 09-40S 125-15E,
   10-05S 125-30E, 11-05S 123-55E.
   WIDE BERTH REQUESTED.
2. CANCEL HYDROPAC 2130/18.
3. CANCEL THIS MSG 11 JUL 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.
Survey operations
A research or survey vessel is mapping the seabed or water column, often while towing equipment.
Towed array / streamer
Equipment towed a long way behind a vessel — sonar, a hydrophone cable, a sampling sled — invisible at the surface.
Tow / towing
A vessel towing another vessel, a barge or a structure — slow, hard to manoeuvre, and with a long line between.
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.
Wide berth requested
Keep well clear — or, when a distance is given ("TWO MILE BERTH REQUESTED"), at least that far away.
Cancellation reference
A line that cancels an earlier warning by its number, such as CANCEL HYDROLANT 1085/12.
HYDROPAC
The U.S. long-range warning series for the Pacific outside NAVAREA XII and for the Indian Ocean, Persian Gulf and adjoining seas.
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

37 within 180 nm since 2006 · 8 in the last 12 months · 3 listed in force now

06
10
15
20
25
26

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

Worldwide in the collected sources

54 survey operations listed in force · see all

Record snapshot 2026-10-02 14:13Z; 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.