index

HYDROARC warnings in force as of 291559Z dec 17: 421/17, 418/17, 322/17, 307/17, 306/17, 293/17, 288/17,…

HYDROARC 423/17

issued: 2017-12-29 16:00Z
status: cancelled 2018-01-05 17:27Z (archive)
cancels: HYDROARC 422/17
authority: SFH 291600Z DEC 17.
source: nga_json · first seen 2026-08-17 13:38Z

Original warning text

1. HYDROARC WARNINGS IN FORCE AS OF 291559Z DEC 17:
   421/17, 418/17, 322/17, 307/17, 306/17, 293/17,
   288/17, 287/17, 274/17, 267/17, 228/17, 189/17,
   188/17, 139/17.
   205/16, 155/16.
   345/15, 343/15.
   269/14, 268/14, 131/14.
   193/12, 112/12.
2. THE COMPLETE TEXT OF ALL IN-FORCE HYDROARC
   BROADCAST WARNINGS ARE AVAILABLE ON THE NGA
   MARITIME SAFETY INFORMATION WEBSITE AT:
   msi.nga.mil/NGAPortal/MSI.portal.
   ALTERNATIVELY, THESE MAY BE REQUESTED BY E-MAIL
   FROM NGA AT [email protected].
3. CANCEL HYDROARC 422/17.

Timeline

HYDROARC warnings in force as of 221243Z dec 17: 421/17, 420/17, 419/17, 418/17, 322/17, 307/17, 306/17,…cancels · 2017-12-22
HYDROARC warnings in force as of 221243Z dec 17: 421/17, 420/17, 419/17, 418/17, 322/17, 307/17, 306/17,…replaced · 2017-12-22
HYDROARC warnings in force as of 051710Z jan 18: 322/17, 307/17, 306/17, 293/17, 288/17, 287/17, 274/17,…cancelled by · 2018-01-05

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Worldwide now

9 index warnings in force

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.