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Navigation prohibited 280100Z to 281600Z sep, alternate 290100Z to 291600Z sep in area between 20-53N 20-30N…

Gulf of Tonkin · Vietnam · HYDROPAC 2931/16

issued: 2016-09-26 15:15Z
status: cancelled 2016-09-29 17:00Z (archive)
self-cancels: 2016-09-29 17:00Z
authority: HAIPHONG RADIO 261228Z SEP 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 280100Z TO 281600Z SEP,
   ALTERNATE 290100Z TO 291600Z SEP
   IN AREA BETWEEN
   20-53N 20-30N AND 107-24E 107-48E.
2. CANCEL THIS MSG 291700 SEP 16.

Activity windows · 2 in this warning

opens (UTC)	closes (UTC)	local	length
2016-09-28 01:00Z	2016-09-28 16:00Z	—	15 h
2016-09-29 01:00Z	2016-09-29 16:00Z	—	15 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.