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    Re: The Nautical Day
    From: Doug Royer
    Date: 2004 Feb 10, 15:27 -0800

    Yes sir you have what I was trying to convey as to the ships'
    day.However,all watches start or at least are designated at 1200 hrs.I don't
    wish to confuse anyone on this point so I will explain.All underway watch
    periods are 4 or 6 hrs. in duration.The daily 1st watch has a starting time
    of 1200 hrs.In a 24 hr period a 6 hr watch schedule has 4 watch periods(1st
    through 4th).A 4 hr watch schedule has 6 watch periods(1st through 6th).
    The vessel is scheduled to leave dockside and make turns for sea at 1035 hrs
    01-02-03.On the above schedule you will know that the last watch section of
    the day(augmented by the extra crewmembers needed to depart)will have the
    duty and take over the watch from the port watch duty section.This doesn't
    mean the entire port watch section just up and walks out handing over
    everything to the just arriveing 4th watch section.Some members of the port
    watch won't be on the 4th watch duty roster and they may depart for other
    duties just as some 4th watch members weren't on the port watch roster and
    they  now report to their scheduled watch sections.
    I believe this is still an industry standard but may be mistaken as I've
    worked for the same organization for many years.
    When one 1st comes onboard a vessel or is reporting from shore leave the 1st
    thing one does after checking in with the OOD is read the station bill.The
    station bill defines all watch periods and assigns qualified crewmembers to
    each section's roster.
    -----Original Message-----
    From: Navigation Mailing List
    Sent: Tuesday, February 10, 2004 07:06
    Subject: Re: The Nautical Day
    Thanks, Doug.
    So if I have this right, the only thing that runs noon to noon is the
    writing up of the log. Even that names the half days by the civil
    calendar, so one sea day (as per the log) could comprise the PM hours of
    01-01-03 and the AM hours of 01-02-03 (US style: 02/01/03 in most other
    countries), for example.
    That does indeed look like a last vestige of the old practice of using
    nautical days.
    As to watch hours: Most of the research ships I have known worked 6-on,
    6-off, though I have heard of some working 12-on, 12-off. (Seamen raised
    in the discipline of the old 4-on, 4-off routine would not recognize the
    watch as being continuously "on" for 12 hours, of course! That is more
    like 12 hours less meals, coffee breaks and a fair amount of sitting
    around between one task and the next.)
    "Soela" had started with 8-hour watches before my time because the
    scientific party (used to office hours ashore) found it easier to cope
    if they had one period of unbroken sleep per day. By the time I was
    working there, the crew had adopted the same routine even though most of
    them had grown up with the far more gruelling work schedules of the
    North Atlantic distant-water trawling fleets. (All except the captain,
    who stuck with 6-on, 6-off and so forced the mate onto the same
    schedule.) 8-on, 8-off also meant that we didn't force the same set of
    guys to stand the graveyard watch every night -- a major concern when
    you have scientists who are used to spending nights at home and only
    have two weeks on board to adjust to routines at sea while getting their
    work done.
    You wrote:
    > Trevor,
    > I didn't say there was a break in any routine at the beginning or end of
    > day.The logs start at noon one day and end at noon the next day while
    > underway or in port.While underway the ships I work on stand either 4 hrs
    > on,4 hrs off or 6 hrs on,6 hrs off continuesly as set by the master(on the
    > Station Bill).Watches while in port have a differant schedule(8 on,8 off
    > 12 on,12 off).So as examples,say I have the 1st 1200 to 1800 watch
    > 01-01-03.I have from 1800 to 0000 off 01-01-03.At 0000 to 0600 01-02-03 I
    > report back for watch continuesly.If I have the 1st 1200 to 1600 01-01-03
    > watch I have from 1600 to 2000 01-01-03 off,report for the 2000 to 0000
    > 01-01-03 watch,have off 0000 to 0400 01-02-03 and report back for watch
    > to 0800 01-02-03 continuesly.
    > All the ships' logs are kept on a noon to noon schedule is what I wanted
    > convey by the ships' day.
    Trevor J. Kenchington PhD                         Gadus@iStar.ca
    Gadus Associates,                                 Office(902) 889-9250
    R.R.#1, Musquodoboit Harbour,                     Fax   (902) 889-9251
    Nova Scotia  B0J 2L0, CANADA                      Home  (902) 889-3555
                         Science Serving the Fisheries

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