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  1. #1
    Join Date
    Oct 2002
    Location
    Plymouth
    Posts
    8,600

    Default Electromagnetic log transducer.

    I see Nasa have a new transducer on the stocks:

    https://www.nasamarine.com/product/electromagnetic-log/

    Not a fresh idea, there have been a number over the years but none has caught on, being thought unreliable and certainly expensive. At £159 this might be a winner; it's said to fit the de facto standard 50mm tube and work with any "compatible" 0183 display.

  2. #2
    Join Date
    Feb 2007
    Location
    Essex
    Posts
    22,871

    Default Re: Electromagnetic log transducer.

    I had a Seafarer version in the 1970s, with a dial readout. It worked very well indeed for many years, though the readout dial broke itself just before I sold the boat. It was far better than the rubbish Navico paddle-wheel on my next boat. I even managed to get the needle against the 10 knot stop in my 26-footer on one occasion. I've always wondered why they didn't catch on. I believe there was a B&G version that preceded the Seafarer.
    Far away is near at hand in images of elsewhere

  3. #3
    Join Date
    Nov 2018
    Location
    Newport IoW
    Posts
    616

    Default Re: Electromagnetic log transducer.

    Thanks Doug748, I will be putting an order in, fed up with paddlewheels.

  4. #4
    Join Date
    Sep 2010
    Location
    West Sussex / Hants
    Posts
    28,771

    Default Re: Electromagnetic log transducer.

    I think the main reason the original ones didn't catch on was one had to be very careful with antifoul; a very good navigator I know rated his Seafarer job excellent.

    It did require careful calibration and is still in the boundary layer flow close to the hull so requires respect and a little caution.

    Anything is better than a paddlewheel, totally unreliable, likely to clog with wee beasties or weed and vulnerable to the slings when the boat is lifted, if people forget to withdraw them.

    I don't understand why people bother with the things, what with the hole in the hull, they're of no use for navigation as I discovered with another boat I had.
    Anderson 22 Owners Association - For info please ask here or PM me.

  5. #5
    Join Date
    May 2008
    Location
    Returned to South Coast from West Coast of Scotland.
    Posts
    1,787

    Default Re: Electromagnetic log transducer.

    That is good news....if it will integrate with Raymarine etc. kit.
    I gave up on paddlewheel instruments years ago and rely on GPS based SOG.

  6. #6
    Join Date
    Jan 2003
    Location
    Portland
    Posts
    1,548

    Default Re: Electromagnetic log transducer.

    You will soon know if its a good idea when all the other manufacturers follow suit.
    I used to be indecisive, but now I'm not so sure...

  7. #7
    Join Date
    May 2001
    Location
    UK East Coast
    Posts
    36,616

    Default Re: Electromagnetic log transducer.

    Airmar and NKE have offered electromagnetic sensors for ages. Rather more expensive, but also more sophisticated.

  8. #8
    Join Date
    Aug 2011
    Location
    On the Celtic Fringe
    Posts
    14,336

    Default Re: Electromagnetic log transducer.

    Quote Originally Posted by wizard View Post
    You will soon know if its a good idea when all the other manufacturers follow suit.
    Garmin have had one for years. I'm fitting one this summer. NMEA 2000 though. It also gives the water temperature so I will need even less convincing not to go overboard.
    Cynical Scottish very nearly retired engineer who sails a Gib'Sea 96.

  9. #9
    Join Date
    Jun 2013
    Location
    Hopefully somewhere warm
    Posts
    9,635

    Default Re: Electromagnetic log transducer.

    Quote Originally Posted by doug748 View Post
    I see Nasa have a new transducer on the stocks:

    https://www.nasamarine.com/product/electromagnetic-log/

    Not a fresh idea, there have been a number over the years but none has caught on, being thought unreliable and certainly expensive. At £159 this might be a winner; it's said to fit the de facto standard 50mm tube and work with any "compatible" 0183 display.
    Certainly looks interesting, ta for the link.
    Not so sure about the blurb though...

    the control box converts the sensor signal to boat speed, trip and total distance and sends it to any compatible NMEA-0183 display.

    Do such nmea0183 sentences exist?

  10. #10
    Join Date
    Nov 2018
    Location
    Newport IoW
    Posts
    616

    Default Re: Electromagnetic log transducer.

    Quote Originally Posted by Seajet View Post
    I think the main reason the original ones didn't catch on was one had to be very careful with antifoul; a very good navigator I know rated his Seafarer job excellent.

    It did require careful calibration and is still in the boundary layer flow close to the hull so requires respect and a little caution.

    Anything is better than a paddlewheel, totally unreliable, likely to clog with wee beasties or weed and vulnerable to the slings when the boat is lifted, if people forget to withdraw them.

    I don't understand why people bother with the things, what with the hole in the hull, they're of no use for navigation as I discovered with another boat I had.
    You need to know your distance run *through the water* for a few things, so I venture to differ on the last bit.

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