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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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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 1-800-633-1468 to locate the
distributor nearest you.
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 1-800-633-1468.
Table of Contents
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