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Thread: Improving furuno 585 display - gaps

  1. #1

    Improving furuno 585 display - gaps

    Hi there

    I have been spending more time trying to improve my skills using my Furuno 585 and have been using manual gain to improve the display and mark marlin. This has been simple to do when drifting or slowly cruising in calm water. However when it gets rougher the pic changes and shows more clutter and produces many "gaps" on the screen. Is this normal or is it likely that the transducer is not deep enough in the water? If not, how can I reduce the number of gaps on the screen?

    Many thanks

  2. #2

    Re: Improving furuno 585 display - gaps

    Sounds like you have hit the nail on the head sounds like you are getting air under it, best thing to do is take a picture of your transducer set up an post it on here so people can have a look, With my 585 when i get on the plane and still want to search for ledges as well as fish i have to back my gain of a long way almost back to nothing but i am consentratiing on ground ledges ect more than fish shows as if i find good looking ground while i am cruzing ill mark it and go back and sound over it slow and put my gain back up and have a good look

  3. #3

    Re: Improving furuno 585 display - gaps

    Hi

    Please see below for pics of my transducer fitted on my Barcrusher. As you can see I have lowered it from it's original location. It now sits below the hull by 10-15mm minimum. I've also attached a shot of the sounder at Port Stephens with a marlin over slimys, as you can see the display I get is very broken and this gets worse in heavy chop. Do you think the transducer needs to be dropped further?

    Thanks again

  4. #4

    Re: Improving furuno 585 display - gaps

    TM258 or 260? Looks deep enough. My 260 is about the same spot. Possibly drop the back end with a plastic wedge to reduce aeration in the slop. Or go deeper. Or both. It is trial & error. More error I am thinking.:grin::grin:
    ROLL TIDE, ROLL.................

    Regards,
    Peter

  5. #5

    Re: Improving furuno 585 display - gaps

    Gday,
    Does it do it on 200khz? Or on 50khz but with the motor off, drifting etc?

    Cheers,
    Myles

  6. #6

    Re: Improving furuno 585 display - gaps

    Quote Originally Posted by pjbfish View Post
    Hi

    Please see below for pics of my transducer fitted on my Barcrusher. As you can see I have lowered it from it's original location. It now sits below the hull by 10-15mm minimum. I've also attached a shot of the sounder at Port Stephens with a marlin over slimys, as you can see the display I get is very broken and this gets worse in heavy chop. Do you think the transducer needs to be dropped further?

    Thanks again
    Mate the barcrusher has a bit of deadrise and as you are aware thry do rock a bit. You need to drop the ducer down and the best way is with the drop down bracket made for the 258 ducer. your problem is entirely due to aerated water. It would be safe to say the better the conditions the better your sounder reads . I have a bracket lying in the shed if your interested Pm me cause I will never use it . I have had a bit to do with these 258 / 260 ducers and they can be difficult to get right There is a bloke called lazyangler on another forum who has good results on a BC but I think he has rhe drop down bracket.

  7. #7

    Re: Improving furuno 585 display - gaps

    Just enlarged the middle pic , your way to high mate, BUT...you will get water going everywhere when you drop it most of which will be stopped by the transom on the BC but this can be stopped with a cover

  8. #8

    Re: Improving furuno 585 display - gaps

    I would also say the ducer needs to go down more. Try taking out the top 2 x screws and push it down so the 2 x lower screws are now the top screws. You will get more spray but as previously said, a cover will fix that.
    Can't really see the angle in relation to the hull line, but can it also be tilted down at the back a little?

    Cheers
    Chris

  9. #9

    Re: Improving furuno 585 display - gaps


    This is my TM 260 in the down position on the "slide" mentioned above. Fisher dead rise is 23 deg. I only use the 260 at slower speeds to look at structure really closely.





    The 600W between the tubes is my normal transducer. I change cables on the 585 to use the 260.
    ROLL TIDE, ROLL.................

    Regards,
    Peter

  10. #10

    Re: Improving furuno 585 display - gaps

    peterbo, thanks for the photos and info. i am in the process of upgrading to a 585 with a 1kw transducer. what is the reason you would chose the 260 over the 258?

    I have read the specs and the way i understand is that the 258 is a more powerful unit when operating in 200hz and the 260 is a better performer in 50hz (in say over 200m).

    Also, why do you use the 600w as your main transducer? would it not be more beneficial to be using the stronger unit all the time and having the 600w as a back up?

  11. #11

    Re: Improving furuno 585 display - gaps

    Don, the 600 was a temporary measure until the SS164 Zero Degree Offset came out. Airmar only made 12 &20 Deg Offsets due to ...........??????
    The 260 is a more powerful unit than the 258. I know some people in the US who have mounted the 260 on the transom with the "kick up" bracket but only on boats with a moderate deadrise..
    My 260 went on after the 600. The 600 shows good pics up to 22-24 knots & bottom trace & depth up to 30 knots depending on sea conditions. On the Fisher, centre line is the best place to mount a ducer as the planing strakes produce lots of aerated water at speed. I only run the 260 at 10 knots or less.
    ROLL TIDE, ROLL.................

    Regards,
    Peter

  12. #12

    Re: Improving furuno 585 display - gaps

    ok Peter, that makes a lot of sense.

    could you explain how much of an improvement the 260 is over the 600? and in what circumstances you really notice the difference?

    i am predominately looking for bottom fishing ground between 60-100m and using a 600w trandsucer. do you think upgrading to a 260 for this type of work would be benificial?

    any input from yourself or other ausfisher's is greatly appreciated.

  13. #13

    Re: Improving furuno 585 display - gaps

    Hi all

    Thanks very much for the comprehensive responses, sorry I've been slow to get back - I've been chasing snapper at Coffs.

    The transducer is a 258. I'll have a go at dropping it down further and see what result I get from that noting that I may get some increased spray.

    Siegfried thanks for your kind offer, I'll see how it goes with dropping it down and get back to you if that 's ok.

    Cheers

  14. #14

    Re: Improving furuno 585 display - gaps

    Don, I fish off Moreton & on the Barwons. The 260 shows up much more detail from 75M on. Fish are easily identified when in the wireweed or really close to structure.
    As to benefits, the 260 is a big unit & may be hard to mount for high speed use. It is not cheap although I got mine in the US last year & carried it home. However it allows the 585 to perform to it's max potential. There are other 1KW ducers (164 series) which are designed to fit in a hole cut into the hull with a very low profile. My 600W is designed to be mounted in this fashion but I am not a fan of cutting holes in a new boat, hence the tab mount off the planing plank.
    ROLL TIDE, ROLL.................

    Regards,
    Peter

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