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  • #31
    Originally posted by alistairuk View Post
    They don't colour them anymore - which is a pain in the ass - only our older ones have the coloured stickers on them, new ones are all red - although given we only carry co2 and dry powder it's pretty obvious which is which.
    I thought they had to have between 3% and 5% of the body colour coded appropriately to the type of extinguisher? That's what we were told in the course

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    • #32
      That's right - they have a colour band on them to indicate type i.e. cream - foam, blue - dry powder etc.

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      • #33
        Originally posted by IFHP View Post
        That's right - they have a colour band on them to indicate type i.e. cream - foam, blue - dry powder etc.
        ok so I've obviously misunderstood what Alistairuk said. Did he mean that they don't colour the whole extinguisher anymore?

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        • #34
          Fire exstinguishers have to be coloured red with a certain percentage in the colour of whatever it

          http://www.gla.ac.uk/media/media_185169_en.pdf thats a handly link

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          • #35
            Originally posted by HarmlessWeasel View Post
            ok so I've obviously misunderstood what Alistairuk said. Did he mean that they don't colour the whole extinguisher anymore?
            Yes many years ago they were completely red, cream, blue and black - now they are red with a coloured band to indicate type.

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            • #36
              Hello ladies/gents,

              I am currently sailing as Third Mate and since I could not find a decent website for orals revision when I was studying for my OOW Orals at WMA, I decided to create one.

              www.passyourorals.co.uk

              Please visit the site and use it to aid you in your revision, whether it be for your orals exam or an upcoming written exam.

              The website contains many .pdf documents which are my own downloadable study notes.

              New content will be added as often as my time allows, but as I'm off to sea for 5 months tomorrow, this will be it for a while!

              Please feel free to contact me about the website at passyourorals@gmail.com

              Thanks, and enjoy!

              And tell your friends about it, too...

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              • #37
                Hi. Does anyone have anything on bridge instruments. I'm in phase 4 and doing a little orals prep now and again and I've got most of it covered but struggling with the corrections and specifically how to apply them. I'm getting confusing answers on google searches. If someone could clarify that would be appreciated....

                My understanding is 2 corrections...

                Height...do you just take a tenth of the height and add e.g. if bridge 20m above sea level your adding 0.2 to the reading?

                Index error...from what i make out is given to you as part of the manufacturer instructions and can be + or - ?
                http://desdons.wordpress.com/

                Twitter: @desdons

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                • #38
                  Swing and a miss. You've mistaken the calibration certificate for Index Error. Revise the correctable errors (Perpendicularity, Side, Collimation, and Index). These should be in your college notes/textbooks or on google.
                  http://www.nauticalalmanac.it/en/nav...rrections.html


                  Then dip is something else completely. You're right in that it's related to height, but it's not so simple as h/100. It's to do with the fact that the visible horizon is lower than the rational horizon (tangental to your position on a spherical earth) and so you have to subtract a correction (good diagram here http://navsoft.com/html/corrections_...ant_altit.html). You can either use 1.76'(height in metres) or use the altitude correction table at the front of the almanac

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                  • #39
                    Sorry...I'm an idiot and should have said the instrument I'm referring to is the Precision Aneroid Barometer...I'm all good with the sextant. Plenty info on that.

                    Thanks for the reply though.
                    http://desdons.wordpress.com/

                    Twitter: @desdons

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                    • #40
                      Haha whoops! In that case, yeah you apply the calibration certificate to the reading (+/-) and then you add the height correction (always +). However, the height correction is dependent upon height (duh) and dry bulb temperature. Brown's Nautical Almanac has the table in it though it should be easily available online.

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                      • #41
                        Ahhh okay....thanks for clarifying and apologies for the confusion!
                        http://desdons.wordpress.com/

                        Twitter: @desdons

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