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  1. #31
    Join Date
    Sep 2008
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    2,461

    Default Re: Navigating without a log

    Quote Originally Posted by john_morris_uk View Post
    Regarding YM using only electronic aids. No you can’t.
    So you have to use a mechanical log or a long bit of string with knots in it? In which case how to we know this Tug boat didn't have a suitable bit of string to measure his speed (and therefore distance covered for Graham).
    Last edited by Mark-1; 20-08-19 at 14:17.

  2. #32
    Join Date
    Sep 2008
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    2,461

    Default Re: Navigating without a log

    Quote Originally Posted by Frank Holden View Post
    Trying to use GPS COG or any sort of electronic compass display just does not work.... do not ask how I know this.....
    I've never had the slightest trouble doing this (and I do mean COG, not Heading.)

  3. #33
    Join Date
    Sep 2008
    Posts
    2,461

    Default Re: Navigating without a log

    Some of the participants in this thread should google Marvin Creamer and have their minds totally blown.

  4. #34
    Join Date
    Mar 2007
    Location
    Atlantic
    Posts
    21,333

    Default Re: Navigating without a log

    Quote Originally Posted by Mark-1 View Post
    I don't have a log. I pretty much know how fast my boat is going without.
    What if you are on another boat?

  5. #35
    Join Date
    Mar 2007
    Location
    Atlantic
    Posts
    21,333

    Default Re: Navigating without a log

    Quote Originally Posted by Mark-1 View Post
    So you have to use a mechanical log or a long bit of string with knots in it? In which case how to we know this Tug boat didn't have a suitable bit of string to measure his speed (and therefore distance covered for Graham).
    No. You use other methods to fix your position.

  6. #36
    Join Date
    Mar 2007
    Location
    Atlantic
    Posts
    21,333

    Default Re: Navigating without a log

    Quote Originally Posted by Mark-1 View Post
    Some of the participants in this thread should google Marvin Creamer and have their minds totally blown.
    510 days! What a waste, imagine if he had done it properly.

  7. #37
    Join Date
    Mar 2007
    Location
    Atlantic
    Posts
    21,333

    Default Re: Navigating without a log

    In years gone by I often skippered an 88 ton Tug on the Clyde. It was demoted to R&R. The hardest thing was managing quite a lot of wobbly people at the end of a days cruising.

  8. #38
    Join Date
    Sep 2008
    Posts
    2,461

    Default Re: Navigating without a log

    Quote Originally Posted by john_morris_uk View Post
    Regarding YM using only electronic aids. No you can’t.
    Quote Originally Posted by Mark-1 View Post
    So you have to use a mechanical log or a long bit of string with knots in it? In which case how to we know this Tug boat didn't have a suitable bit of string to measure his speed
    Quote Originally Posted by capnsensible View Post
    No. You use other methods to fix your position.
    Great, which is what this Tugboat does without an electronic log.
    Last edited by Mark-1; 20-08-19 at 14:47.

  9. #39
    Join Date
    Sep 2008
    Posts
    2,461

    Default Re: Navigating without a log

    Quote Originally Posted by capnsensible View Post
    What if you are on another boat?
    I've got no empirical evidence to back this up but I think I know on other boats too. I think everyone knows when the log is badly calibrated even on other people's boats so we must know roughly what speed we're doing. Be interesting to do a few tests to find out. I can only offer one example of someone whos estimate was measurably better than his log.

  10. #40
    Join Date
    Mar 2003
    Location
    s e wales
    Posts
    17,651

    Default Re: Navigating without a log

    Quote Originally Posted by Graham_Wright View Post
    Son took a tug across from the Clyde to Northern Ireland. His nav was completely dependent on GPS.

    When chastised, he told me no tugboats have logs. He had a compass but couldn't read it as the dome was obscured.

    He became stroppy when asked what would happen with a GPS outage.
    Views?
    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?
    this post is a personal opinion, and you should not base your actions on it.

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