Question about Garmin GPSMAP 235 Sounder GPS Receiver

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Garmen 240 fishfinder

Display showed a depth of 17,000 ft and then the graph disappeared. Speed, battery, and temp still displayed. In a test bucket of 1ft it reads 1.6+.

Unit or transducer problem?

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  • chucklehead1 Jul 27, 2008

    Boat was not moving in ~30 ft when it read 17000 prior to the graph going blank.

    No clicking sound can be heard.

    Thanks for the info on test bucket depth.

    Just fyi the unit now reads 8ft in the bucket, seems to be climbing since I truned it on a few hours ago.

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A test bucket wont work, A 200 khz transducer will generally not work in anything less than 2' of water, due to surface clutter. If the transducer is working, you should hear it make a ticking sound.

When you got the 17000 foot reading was your range set to auto?

How is the transducer situated on the boat? Sometimes turbulence and bubbles from the hull can cause erroneous readings, including unrealistic depths, or no depth at all. Stop the boat and turn off the engin e and anything electrical to see if problem repeats itself. If it only crops up when the boat is moving then it is most likely the transducer location.

Posted on Jul 26, 2008

  • Paul Hyde
    Paul Hyde Aug 19, 2008

    For some reason I didn't get notified that you responded.



    No clicking sound in the transducer means it is not getting power from the sounder. This could be due to a damaged transducer cable, a loose plug, or an internal problem in the display. Go down to your local marine supply and ask to buy a transducer for test purposes. plug it into the transducer socket on the 240 and listen for the ticking sound. If it's not ticking the problem is in your 240 and it needs to be sent out for service. Most big retailers will let you return a transducder if it hasn't been installed.

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