Exercises

Hazardous operations 022300Z to 042200Z may, alternate 042300Z to 052200Z may in area between 20-53N 20-30N…

Gulf of Tonkin · Vietnam · HYDROPAC 1561/17

issued: 2017-05-02 12:41Z
status: cancelled 2017-05-05 23:00Z (archive)
self-cancels: 2017-05-05 23:00Z
authority: HAIPHONG RADIO 021233Z MAY 17.
source: nga_json · first seen 2026-08-17 13:38Z

Original warning text

GULF OF TONKIN.
VIETNAM.
DNC 23.
1. HAZARDOUS OPERATIONS 022300Z TO 042200Z MAY,
   ALTERNATE 042300Z TO 052200Z MAY
   IN AREA BETWEEN
   20-53N 20-30N AND 107-24E 107-48E.
2. CANCEL THIS MSG 052300Z MAY 17.

Activity windows · 2 in this warning

opens (UTC)	closes (UTC)	local	length
2017-05-02 23:00Z	2017-05-04 22:00Z	—	47 h
2017-05-04 23:00Z	2017-05-05 22:00Z	—	23 h

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

Nearby now · within 120 nm

Nothing else in force within 120 nm.

Worldwide now

35 military exercises in force · see all

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.