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Navigation prohibited 072300Z to 080400Z dec, alternate 090300Z to 090400Z dec in area between 20-51N 20-37N…

Gulf of Tonkin · Vietnam · HYDROPAC 3797/16

issued: 2016-12-07 05:11Z
status: cancelled 2016-12-09 05:00Z (archive)
self-cancels: 2016-12-09 05:00Z
authority: HAIPHONG RADIO 070459Z DEC 16.
source: nga_json · first seen 2026-08-17 13:38Z

Original warning text

GULF OF TONKIN.
VIETNAM.
DNC 23.
CHART 93650.
1. NAVIGATION PROHIBITED 072300Z TO 080400Z DEC,
   ALTERNATE 090300Z TO 090400Z DEC
   IN AREA BETWEEN
   20-51N 20-37N AND 107-24E 107-40E.
2. CANCEL THIS MSG 090500Z DEC 16.

Activity windows · 2 in this warning

opens (UTC)	closes (UTC)	local	length
2016-12-07 23:00Z	2016-12-08 04:00Z	—	5 h
2016-12-09 03:00Z	2016-12-09 04:00Z	—	1 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

34 other warnings in force · see all

Other

Everything the classifier did not place elsewhere. All current other warnings →

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.