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  1. #51
    Join Date
    Dec 2002
    Location
    Gloucestershire
    Posts
    5,384

    Default Re: Navigating without a log

    Quote Originally Posted by Mark-1 View Post
    Well you know time so I'm not sure there's much of a distinction in the real world. If you have one you have the other.

    If you keep a second by second record and determine an average!



    So it wasn't opaque.
    I'd rather be naked
    www.mastaclimba.com

  2. #52
    Join Date
    Dec 2002
    Location
    Gloucestershire
    Posts
    5,384

    Default Re: Navigating without a log

    Quote Originally Posted by birdseye View Post
    An accident waiting to happen with that attitude. Doesnt matter what other tugs do - he has a legal duty to keep a log and will lose his ticket if an accident investigation finds he hasnt done so.

    GPS outage isnt a significant threat - only ver happened to me once since the system started and that was in an electrical storm off Ilfacombe at 0200 hours. Pi55ing rain, no vis so steer away from land and wait for improvement. The log wouldnt have helped - I knew where I was when the GPS failed and I had a paper chart. The latter is most important. Does your son have those?
    There are two sorts of log. The book with a pencil is the easy one.
    I'd rather be naked
    www.mastaclimba.com

  3. #53
    Join Date
    Nov 2009
    Location
    Home UK Midlands / Boat Croatia
    Posts
    20,384

    Default Re: Navigating without a log

    Quote Originally Posted by Graham_Wright View Post
    There are two sorts of log.
    Is one of them a plank as per #46?

    Richard

  4. #54
    Join Date
    Sep 2008
    Posts
    2,461

    Default Re: Navigating without a log

    Quote Originally Posted by Minn View Post
    On a power driven vessel you calculate propeller revolutions and slip. Job done.
    Like it and I hadn't thought of it. Obvious once you know.

  5. #55
    Join Date
    Aug 2009
    Location
    Scotland.
    Posts
    14,368

    Default Re: Navigating without a log

    Quote Originally Posted by Mark-1 View Post
    Like it and I hadn't thought of it. Obvious once you know.
    In the 1970's sailing with my father on a typical coastal trade size vessel, I remember they steamed the log out the back of ship.

    My dad was Chief Engineer on Amber, which was the vessel my Mum, brother and I used to cruise all over the place on. http://www.coasters-remembered.net/s...ead.php?t=9145

    As a by-the way, the crew would put stops into the drains where the hatches fold into when open and convert the space into a swimming pool. What great days.
    "'...contradictions .... are deliberate exercises in doublethink." Orwell from 1984

  6. #56
    Join Date
    Mar 2007
    Location
    Atlantic
    Posts
    21,327

    Default Re: Navigating without a log

    Top memory jogger, ta! Had forgotten all about streaming the log on yachts. Ive actually still got a Walker Log on the yacht somewhere but not used it for years.

    Had also forgotten setting dived submarine speed to shaft revs.

    These posts are really good for those reminders!

  7. #57
    Join Date
    Dec 2002
    Location
    Gloucestershire
    Posts
    5,384

    Default Re: Navigating without a log

    Quote Originally Posted by capnsensible View Post

    Had also forgotten setting dived submarine speed to shaft revs.
    Could come in handy one day
    I'd rather be naked
    www.mastaclimba.com

  8. #58
    Join Date
    Mar 2003
    Location
    s e wales
    Posts
    17,633

    Default Re: Navigating without a log

    Quote Originally Posted by prv View Post
    I think you may have rather missed the point of the thread

    Pete
    Seems I have. Never thought he wouldnt have a speedo. In which case I dont see what the problem is.
    this post is a personal opinion, and you should not base your actions on it.

  9. #59
    Join Date
    Jun 2016
    Location
    North West
    Posts
    560

  10. #60
    Join Date
    Jul 2008
    Posts
    1,775

    Default Re: Navigating without a log

    Quote Originally Posted by capnsensible View Post
    Top memory jogger, ta! Had forgotten all about streaming the log on yachts. Ive actually still got a Walker Log on the yacht somewhere but not used it for years.

    Had also forgotten setting dived submarine speed to shaft revs.

    These posts are really good for those reminders!
    This brings back memories of a trip I undertook to Antigua on a 40' trimaran. It had a Transit satnav which failed off Ushant (the antenna fell from the mast-head). The log was a Walker Knotmaster and we had no depth sounder.

    The Walker log worked fine up to about 15 knots; faster than this and the impeller would take off on the crest of each wave, thus spending at least half its time in the air. The log therefore underread by a significant amount.

    Another disadvantage manifested itself as we reached warmer waters: as much of our trip was spent sailing at high speed, it became apparent that certain big fish were attracted to the trailing impeller. We lost three impellers during the transatlantic trip.

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