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Fish Finders/Depth Sounders Question

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  • Fish Finders/Depth Sounders Question

    Are there any out there that actually work at speeds around 25 knots ? This is my second Humminbird and the piece of ***** doesnt read bottom once Im up and plaining<sp?? . Its only a 30 HP / 14 ft. boat so Im not going a 100 miles an hour . I fish and travel up and down the river and its quite shallow , make that propeller shattering shallow in places . Tell me what works and what doesnt , thanks !!Jeff

  • #2
    Re: Fish Finders/Depth Sounders Question

    I vote Garmin. I have a Garmin Fishfinder 240 Blue and it is flawless. Check out the site http://www.garmin.com/marine/ My boat runs 22 wot and the unit never skips a beat up to 1500 ft deep. Garmin is known for excellant support. I also have the 215 Chartplotter and it has performed flawlessly also.

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    • #3
      Re: Fish Finders/Depth Sounders Question

      In order to read bottom, let alone fish, at any speed, it appears that the tranducer plays a large part along with the sounder. Check out airmar.com for tranducer info. Furuno's LS-6100 keeps coming up as a good quality unit in the $300 range. I have the same problem you do. Good Luck
      Lake Shasta with Mt. Shasta in the background, June 2011

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      • #4
        Re: Fish Finders/Depth Sounders Question

        I can read the bottom at about 35 knots with the new hummingbird pirahana 1 it is supposed to be portable but I mounted it. I read the bottom unless I am crossing a wake. Walmart $99

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        • #5
          Re: Fish Finders/Depth Sounders Question

          I bought a cheap Hummingbird 100 at C.T.C. because the boat I bought had no depth finder at all. I followed the mounting directions to a tee making sure the sensor unit was OUT of the prop wash but still in the water at plaining speeds.(about equal distace from the outdrive as the speedo pick up tube 24" but on the other side of the hull). Mounted it sits about a 1/4 inch below the hull at the inside of the sensor. After some fine tuning (angling the rear of the sensor downward) it was able to keep the signal up to 33 knots. I set my viewer's depth alarm for 5 feet which is only aboat 3 feet bellow the hull at trolling speeds or when I drift. When at plaining speeds, I have the alarm set to 9 feet or more in less familiar waters and then slow down accordingly.

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          • #6
            Re: Fish Finders/Depth Sounders Question

            just curiuos... if it were working and yourrunning at 25 knotts, by the time the alarmsounded wouldn't it be too late? for me, knowing the underwater terrain is mostimportant. buy a marine map of your area thatwill show shallow areas and plot your course accordingly. just my .02

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            • #7
              Re: Fish Finders/Depth Sounders Question

              MellowYellowI wasnt going that fast and there is a new ledge out there that wasnt visible a few days ago . The river has dropped almost 6 feet in the last 2 weeks and the channels and voids change yearly and I had the bottom alarm set but by the time it went off and I hit stop the prop already caught the rocks . I am fully perpared and have a bottom map but the river changes so much because of the fast current . Ive done all the tricks for mounting that transducer properly . Ive had a few boats now with Humminbirds on them and they seem to work good for a while then take a hissy fit and go south JeffPS . I also wanted to add that if the bottom would have been showing correctly like its suppose to , I could have noticed the quickly changing bottom and made a stop before the alarm went off and destroyed my propeller

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              • #8
                Re: Fish Finders/Depth Sounders Question

                I stand corrected then.... 6ft in 2 wks. is huge.hope you get the answers you need here to preventit from happening again. :o good luck,M.Y.

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                • #9
                  Re: Fish Finders/Depth Sounders Question

                  Here is a preventative solution that Ill be installing www.propsavers.com Its called the River Runner .Jeff

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                  • #10
                    Re: Fish Finders/Depth Sounders Question

                    Jeff, if you are running a 14' boat maybe there is no point in your transom that is far enough away from the motor and still enough in the water. my humminbird won't read underway on my 16' either. I suspect wake turbulence because I've had to sit it too near the prop to make way for trim tabs. I've been thinking about an in boat transducer installation in the bottom of the bilge. There are posts here about how to do it --supposedly if you seat it in epoxy it works well but I'm worried there is no turning back once you do it!

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                    • #11
                      Re: Fish Finders/Depth Sounders Question

                      I called Hummingbird today asking about the Pirana models, specifically the maximum boat speed at which the models will still measure depth. The rep. I talked with said, "depending on tranducer mounting and location, they will work up to 60 mph"...I assume they mean whether or not the tranducer is mounted inside the hull or out and how free of turbulence it is...

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                      • #12
                        Re: Fish Finders/Depth Sounders Question

                        Through information I have got from here and the Newsgroups and talking about the subject with other boat owners on the river I fish in . The Garmin models (i.e 240) do work without problems . This thing of mine would be good enough for lake fishing at trolling and just above that speed . Im going to buy the Garmin and sell this Hummincrap . Thanks for all your input , great as usual.Jeff

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                        • #13
                          Re: Fish Finders/Depth Sounders Question

                          I suspect that it could be the way the transducer is mounted, but I really don't have a good solution other that making sure there is a smooth surface all the way to the transducer. I just installed a Garmin 160? last weekend on mine and it reads the bottom and fish at 40 mph. Just lucky on the mounting location.

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                          • #14
                            Re: Fish Finders/Depth Sounders Question

                            I moved the transducer down an inch and Ill test it tomorrow . One more chance for the ole Humminturd Jeff

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                            • #15
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                              Re: Fish Finders/Depth Sounders Question

                              Know where you're comin' from with those shifting sandbars. I got 'em on the way to my house, too. Ran hard aground on one last evening in a remote area at 30 mph at 7 PM. Had to sit there watching the approaching darkness and lightning storm, listening to the severe weather alerts on the VHF, until 1 AM when the tide returned and let me push 'er off this morning. Don't think I really deserved the treatment I received from my wife, though, after my ordeal and all.I have a Raytheon 465, but it's useless in avoiding sudden ledges. I'm told that the beam is less than an inch in diameter at depths of less that 10 ft. It reads the bottom great, though, at 45 mph.
                              When in doubt .... Gas it!

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