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Check to make sure the transducer is hooked up correctly, and check the actual transducer for signs of damage. Transducers are fragile, and a good whack can break the crystal inside. For more troubleshooting, here is a helpful link with the Owners Manual for your Humminbird.
http://store.humminbird.com/media/document/PiranhaMAX_150-160-170-180-190c.pdf
Go to the Menu and check your settings. There are tolerances you can adjust the sensitivity so it will track smaller objects. Here is a helpful link to the manual for your Humminbird if you don't have it.
http://store.humminbird.com/media/document/586c_596c_HD_DI_Manual.pdf
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