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This was posted at https://sattrackcam.blogspot.com/2021/09/an-upcoming-trident-ii-d5-slbm-test-in.html

Th blog post notes something as a "navigational warning".

A few days ago a Navigational Warning (NAVAREA IV 838/21, also issued as HYDROLANT 2336/21) appeared

And it says that the warning mapped to a upcoming missile test. (check the link)

The text is this:

151459Z SEP 21
NAVAREA IV 838/21(11,24,26).
ATLANTIC OCEAN.
FLORIDA.

1. HAZARDOUS OPERATIONS 171230Z THRU 200123Z SEP
   IN AREAS BOUND BY:

   A. 28-56N 079-59W, 29-02N 079-53W,
      29-06N 079-37W, 28-59N 079-10W,
      28-37N 079-10W, 28-36N 079-35W,
      28-45N 079-56W.             

   B. 28-24N 076-44W, 28-42N 076-42W,
      28-21N 074-40W, 28-06N 074-44W.

   C. 27-27N 071-21W, 27-52N 071-15W,
      27-25N 068-46W, 26-54N 068-54W.

   D. 17-22N 044-54W, 18-33N 044-32W,
      16-54N 040-55W, 16-00N 041-23W.
   
   E. 09-00S 003-51W, 08-22S 003-22W,
      12-35S 002-40E, 13-05S 002-19E,
      11-56S 000-16E, 12-09S 000-16W,
      11-34S 000-20W.

2. CANCEL THIS MSG 200223Z SEP 21.

Is this a threat to planes? Do pilots and/or other relevant bodies consider this?

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    $\begingroup$ Given that there's no altitude information, and the first answer quoting only boats, this isn't about aviation. I'm voting to close for being off-topic. $\endgroup$
    – user14897
    Commented Oct 15, 2021 at 4:21
  • $\begingroup$ @ymb1 for people sailing or flying in that part of the world. read the answer. $\endgroup$
    – FriendlyFire
    Commented Oct 15, 2021 at 5:25
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    $\begingroup$ "Navigational Warnings In support of the Global Maritime Distress and Safety System (GMDSS), Broadcast Warnings are promulgated by the Worldwide Navigational Warnings Service (WWNWS) to provide rapid dissemination of information critical to navigation and the safety of life at sea." 1 – The answer inferred flying, but did not quote flying. A simple search would have shown this is not used by aviation bodies. $\endgroup$
    – user14897
    Commented Oct 15, 2021 at 5:42
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    $\begingroup$ Your original question was "What is the meaning of this text? what paths are dangerous? what is a Navigational Warning?" Come on. Sure you can pivot it if you want, after knowing it's maritime only, but does not make it on-topic here. And the edit invalidates the answer, which is not acceptable here. $\endgroup$
    – user14897
    Commented Oct 15, 2021 at 5:49
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    $\begingroup$ To be clear - neither I or, nor any other pilots I know, reference the Navigational Warnings promulgated by WWNWS. This is the first I've ever heard of them. It is standard for pilots to reference TFRs and NOTAMS, with other lookups based on where you're going. TFRs and NOTAMS do cover missile launches, like the one you referenced. $\endgroup$
    – Tyler
    Commented Oct 15, 2021 at 19:03

1 Answer 1

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It looks like a warning for people sailing or flying in that part of the world. Google says:

Navigational warnings (NAVWARNs) contain information for boaters about changes to navigational aids and current marine activities or hazards, such as: defects. dredging.

The latitude and longitude points will show you exactly where expected danger is expected to occur. It has a map in the article you linked - what else would you like to know about what parts are dangerous?

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  • $\begingroup$ I updated the question. $\endgroup$
    – FriendlyFire
    Commented Oct 15, 2021 at 4:09
  • $\begingroup$ Where does google say about flying? $\endgroup$
    – FriendlyFire
    Commented Oct 15, 2021 at 4:10
  • $\begingroup$ Google didn't say anything about flying, but if there were an ICBM test I certainly wouldn't fly inside those boxes. $\endgroup$
    – Tyler
    Commented Oct 15, 2021 at 4:49
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    $\begingroup$ "Google says [...]": To be fair with the content author, it's not Google which says that, but the Maritime Safety Office, msi.nga.mil/NavWarnings. Google just cites it. $\endgroup$
    – mins
    Commented Oct 15, 2021 at 9:40
  • $\begingroup$ There might be a corresponding NOTAM -- notice to airmen, which warns fliers to avoid this area. It also might be inside a published warning area, which would simply "go hot" around the time of the launch. So there are ways that pilots get this sort of info, but the document in the OP is not it. $\endgroup$
    – Ralph J ♦
    Commented Oct 16, 2021 at 3:47

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