An Illustrated Guide to Maritime Signal Flags

(rabbitwaves.ca)

161 points | by gaws 8 months ago ago

46 comments

  • function_seven 8 months ago

    So I just read the other thread about the K language[1] and how it's so-very-concise syntax made the author feel certain ways.

    But that has nothing on this! From page 70 of the International Code of Signals[2], we find that PG 2 means, "I am dazzled by your searchlight. Extinguish it or lift it."

    Not bad, but what if you reply with "AX 1"? Lots going on there! "Shall I train my searchlight nearly vertical on a cloud, intermittently if possible, and, if your aircraft is seen, deflect the beam upwind and on the water to facilitate your landing?"

    [1] https://news.ycombinator.com/item?id=41886051

    [2] https://rabbitwaves.ca/media/docs/ics_pub102bk.pdf

  • GJim 8 months ago

    I have a copy of the International Maritime Organisation (IMO) Code of Signals on my bookshelf.

    3 letter medical flag codes include:

    MKH Foreskin will not go back to normal position

    MKI Patient has swelling of the testicles

    MLF Patient has Delirium Tremens

    It's a comprehensive book to say the least!

    • greggsy 8 months ago

      I wonder how many times MLF has been used for a ship’s captain?

    • ragazzina 8 months ago

      Strange there's no flag meaning "Discard all previous/following flags".

      • GJim 8 months ago

        YN Cancel my last signal/message

        Or in the case of medical flags...

        MPR Patient has died

        might do the job.

    • nocoiner 8 months ago

      Y38.5 - medical diagnosis code indicating injury caused by terrorism involving the use of nuclear weapons.

  • wrycoder 8 months ago

    This is from 100 Rabbits. Great job!!

    One of my favorite flag signals is, “Nothing can be done until high tide.”

    • ahazred8ta 8 months ago

      US1 Nothing can be done until daylight. US2 Nothing can be done until tide has risen. US3 Nothing can be done until visibility improves. US4 Nothing can be done until weather moderates. US5 Nothing can be done until draft is lightened. US6 Nothing can be done until tugs have arrived.

  • raldi 8 months ago

    I liked the Flag Semaphore page it linked to, but it raises the question: Why are the letters almost, but not quite in clockwise order?

    If you sort by clock position, you get:

    A B C D E F G H I K L M N O P Q R S T U Y Cancel # J V W X Z

    Was it invented by someone whose alphabet didn't have J, V, W, X, Z?

  • acidburnNSA 8 months ago

    Fun fact based on the bottom panel: the peace sign (inverted y) is based on the flag semaphore signs for N and D, originally standing for Nuclear Disarmament.

    • raldi 8 months ago

      This sounds like one of those ridiculous "facts" that gets passed around by word-of-mouth despite seeming suspiciously just-so.... and yet in this case, it appears to totally check out.

    • euroderf 8 months ago

      The alternative explanation was that the peace sign is an abstraction of the foot of a dove.

      I'd go with the semaphore explanation.

  • roywiggins 8 months ago

    Vaguely related: "Wuthering Heights in Semaphore" https://m.youtube.com/watch?v=kqiUGjghlzU

  • UniverseHacker 8 months ago

    This seems like a great system, but in many years of sailing I've never encountered it actually used. For the most part is only possible to be used by large commercial vessels, but those vessels already have a dozen other redundant communication systems that are clearer and faster. Operators of small private vessels aren't likely to even know this system exists, not alone carry all of these flags, a code book, and a system for hoisting flags.

    • pjc50 8 months ago

      It's a relic from the age of sail. Example from a few minutes googling: https://tegfan.net/2014/09/05/the-windrush/

    • sellmesoap 8 months ago

      A blue water sailing vessel might have a yellow Q flag on board for 'quarantine', signaling for officials to come document the arrival in a foreign port.

    • somat 8 months ago

      I have only seen it on US navy vessels, I have never seen it used for communications, but they like to put up the ships id on the flags, And I always enjoy breaking out the manual and fumble my way through deciphering the flags when I see them.

    • 8 months ago
      [deleted]
    • tialaramex 8 months ago

      Yes. Anything serious is internationally required to carry (and many smaller things would be required by local laws, or strongly advised to carry anyway) a modern digital maritime radio - the technology is called DSC, Digital Selective Calling.

      • UniverseHacker 8 months ago

        Yes- and even many cheap handheld VHFs have DSC nowadays.

  • throw0101c 8 months ago

    For more on 'pronunciation' see:

    * https://en.wikipedia.org/wiki/NATO_phonetic_alphabet

    IMHO it's very useful for IT/computer people to have this memorized as it is fairly common to have to spell something out to someone orally (over phone, video call, in office).

    Even day-to-day life: to spell your personal name or street name.

    • fastasucan 8 months ago

      I don't know if it is just me, but it seems like english speakers have to spell out stuff a lot more than other languages (or at least my native language). I have never heard anyone having to spell out anything in f.ex a podcast in my native language, but it happens quite regular in english speaking shows. Is english more prone to have muted sounds/letters?

      • Maakuth 8 months ago

        Yes, yes it is. My understanding is that it used to be spoken in a way closer to the written form, but it has drifted. And then there are all the loan words that retain at least some of their original pronunciation.

        Here's a fun clip about it, focusing on British place names: https://www.youtube.com/watch?v=uYNzqgU7na4

    • n_plus_1_acc 8 months ago

      In my experience, normal people are quite confused by this. I've heard "Is that Juliette with a J?" and facepalmed.

      • petschge 8 months ago

        In my experience people understand perfectly well but assume that you are ex-military.

        • dctoedt 8 months ago

          > In my experience people understand perfectly well but assume that you are ex-military.

          When I use phonetic alphabet on the phone, I preface it by saying, "Let me spell it in 'airline pilot': ...." (But yes, I learned it in the Navy.)

  • lelandfe 8 months ago

    It feels like magic to be able to highlight and translate the Russian and Japanese birds on macOS. Japanese bird: "Help me!" Russian bird: "I understand!" And I do too!

    There are a couple more in this series here: https://rabbitwaves.ca/site/about.html

  • cbsks 8 months ago

    Interesting that “Oscar” is pronounced “OSS CAH” and not “OSS CAR”. Same with Victor. Must have been made in New England (northeastern US).

    • tialaramex 8 months ago

      These pronounciations are for the International radiotelephonic spelling alphabet, often referred to as a "NATO Phonetic alphabet". For numerals procedures vary slightly, and they've chosen IMO. The sounds are chosen to try to maximize the chance that two people who know this system, even if they don't speak any shared languages, will successfully communicate the symbols intended, so they're not about how you might pronounce these words in any particular place, but rather a plausible pronunciation everybody can approximate and understand.

      • euroderf 8 months ago

        This makes sense. "R" is throaty in (e.g.) English and French, and a tap or a trill in many other languages.

        • f1shy 8 months ago

          Allow me to be pedantic: In some dialects of english.

    • raldi 8 months ago

      I thought 5 was supposed to be pronounced "fife" but this page only seems to half say that. ("faif" in the first row, but "five" in the second)

      • ahazred8ta 8 months ago

        IIRC in WWII the UK settled on 'fife' and nine, while the US went with five and 'niner'. Arthur C. Clarke's novel Glide Path described the adoption of fife.

    • brickers 8 months ago

      Or… England?

      • cbsks 8 months ago

        Ouch. My stereotypically-American US-centric bias is showing :)

      • pc86 8 months ago

        Old England.

        • kevin_thibedeau 8 months ago

          With the new non-rhotic affectation.

          • eadmund 8 months ago

            Which is really getting out of hand, to the point that some English speakers are starting to sound positively French: ‘cweam’ instead of ‘cream’ the same way the French turned ‘rex’ into ‘wa.’

            I blame the EU.

      • f1shy 8 months ago

        I was tempted to say "parts of England"... but I wanted to mean "parts of the united Kingdom"... so... you are right :)

  • nnf 8 months ago

    This is a neat style, and I was pleased to see that the author included accessible text since the visible text on the page is all in images.

  • NKosmatos 8 months ago

    Nice cartoonishly font, clear language, nice graphics and fast to load… why can’t more pages be like this one?

    • Tepix 8 months ago

      It's all graphics²! I think unicode has symbols for the flag alphabet, that would be another option.

      ² To be fair, there appears to be alternative text for those who cannot see the graphics

  • graypegg 8 months ago

    Just FYI, for anyone that didn't notice (like me at first), words in a dashed box are links! There's a description of dayshapes, and lots more info about semaphore on other pages.

  • f1shy 8 months ago

    I really like the 3-way-handshake at the end...

  • foo42 8 months ago

    I never knew anything about this. I love discovering this sort of thing!