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  1. #1
    Join Date
    Jul 2019
    Posts
    3

    Default Manual depth finder

    In case my electronic Depth Sounder doesn’t function, is there a ‘marine’ plumb line I can buy or, at a push, any suggestions re how to make one to check depth in shallower waters?

  2. #2
    Join Date
    Sep 2011
    Posts
    174

    Default Re: Manual depth finder

    https://www.force4.co.uk/hand-leadline.html

    Fairly trivial to make one: lump of heavy and a marked line

  3. #3
    Join Date
    Aug 2011
    Location
    On the Celtic Fringe
    Posts
    14,156

    Default Re: Manual depth finder

    For £25 plus postage and packaging I can supply a brick and a length of line up to 10 fathoms. Greater that 10 fathoms its £65.

  4. #4
    Join Date
    Jul 2019
    Posts
    3

    Default Re: Manual depth finder

    Got the message & it’s clearly time to end the thread. On a serious note we used one a long time ago on coastal passage harbours & we certainly hadn’t made it ourselves so I just thought that there might be something for mariners not in possession of lumps of metal - probably a basic decorator’s will do the job.

  5. #5
    Join Date
    Feb 2007
    Location
    Essex
    Posts
    22,426

    Default Re: Manual depth finder

    I started saving the lead tops from wine bottles to make a lead, until my wife started chucking them away, and then they started using tinfoil and I gave up.

    You might find the odd church roof still available.
    Far away is near at hand in images of elsewhere

  6. #6
    Join Date
    Jun 2001
    Location
    Oban
    Posts
    779

    Default Re: Manual depth finder

    For a quick indication, I use a length of line (about 10m) with a short piece of lead pipe on the end. Different colour corks are attached at 1.5m (boat's draft), 2m, 3m and 4m. This has helped to find the way through some shallow patches.

    The trick is to have a loop round your wrist, then throw the weight out in the direction you want to find the depth. Noting the colours not floating gives a quick indication of depth in that direction.

  7. #7
    Join Date
    Sep 2001
    Location
    Me - Zumerzet Boat - Wareham
    Posts
    12,153

    Default Re: Manual depth finder

    A fishing weight and a length of marked cord does a job.
    MontyMariner.co.uk
    Facilitated by AWESEM WP Agency

  8. #8
    Join Date
    Dec 2012
    Location
    Gone cruising
    Posts
    2,326

    Default Re: Manual depth finder

    For around €25 you can buy a handheld backup depth sounder/fish finder: https://www.aliexpress.com/item/32794272731.html

    Just check the frequency (200 kHz in this case) isn't the same as your existing transducer. If it is, you must disable (switch off) your existing one, else they will interfere with each other.

  9. #9
    Join Date
    Jul 2006
    Posts
    4,749

    Default Re: Manual depth finder

    When it was my only depth sounder I used a lump of lead maybe about a pound weight with a length of sash cord with various carefully whipped marking tags. Now occasionally I use an old heavy shackle with a bit of string just to check the electronic sounder offset and accuracy.

    Actually sailing with just a leadline makes you much more careful: the first accidental grounding I had was shortly after fitting an early Seafarer II spinning-neon sounder - it let me cut corners that I wouldn't have dared otherwise.

  10. #10
    Join Date
    Jun 2007
    Location
    Oban
    Posts
    1,787

    Default Re: Manual depth finder

    https://www.yachtingmonthly.com/sail...eadlines-28316
    I am the only one who grew up using a lead line routinely?

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