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Table of Contents |
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Troubleshooting | 38 |
FishFinder Doesn’t Power Up | 38 |
FishFinder Defaults to Simulator with a Transducer Attached | 38 |
Display Problems | 39 |
Finding the Cause of Noise | 40 |
Humminbird® FishFinder Accessories | 40 |
Specifications | 41 |
Contact Humminbird® | 42 |
NOTE: Entries in this Table of Contents which list (International Only) are only available on products sold outside of the US and Canada by our authorized International Distributors. To obtain a list of authorized International Distributors, please visit our website at www.humminbird.com or contact our Customer Resource Center at
NOTE: Entries in this Table of Contents which list (with Temp/Speed Only) require the purchase of separate accessories. You can visit our website at www.humminbird.com to order these accessories online or contact our Customer Resource Center at
How Sonar Works
Sonar technology is based on sound waves. The Humminbird® FishFinder uses sonar to locate and define structure, bottom contour and composition, as well as depth directly below the transducer.
Your FishFinder sends a sound wave signal and determines distance by measuring the time between the transmission of the sound wave and when the sound wave is reflected off of an object; it then uses the reflected signal to interpret location, size, and composition of an object.
Sonar is very fast. A sound wave can travel from the surface to a depth of 240 ft (70 m) and back again in less than ¹⁄₄ of a second. It is unlikely that your boat can "outrun" this sonar signal.
Single Beam Sonar
Your Humminbird® FishFinder 585c uses a 200 kHz single beam sonar system with a 20° area of coverage. Depth capability is affected by such factors as boat speed, wave action, bottom hardness, water conditions and transducer installation.
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