Garmin Fishfinder 160C Owner's Manual

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Garmin Fishfinder 160C Owner's Manual Manual pdf 25 page image

Fishfinder 160C Owner’s Manual 21APPENDIX > SPECIFICATIONSUnderstanding SonarThis section is intended to help the novice user gain someunderstanding of how the Fishfinder 160C operates and how it canhelp improve fishing productivity.To understand what the unit is displaying, it is important to havea general knowledge of how the unit works and how it determineswhat to display. Briefly described, the unit operates by transmittingsound waves toward the bottom of a lake, stream, or seabed in acone-shaped pattern. When a transmitted soundwave strikes anunderwater object such as the bottom, a piece of structure, or a fish,sound is reflected back to the transducer. The transducer collects thereflected sound waves and sends the data to the unit to be processedand displayed on the graph. The underwater data is displayed onthe graph in the order that it is returned: first returned—first on thegraph. The diagram to the right demonstrates this by showing anunderwater scene as it would be displayed on the graph. Generallyspeaking, if the only thing between the transducer and the bottomis water, the first strong return will come from the bottom directlybelow the transducer. The first strong return sets the bottom level.Weaker secondary returns provide the detailed data. Sonar returnsdisplay as reds (strongest), then oranges (strong), yellows (medium),greens (weaker), and blues (weakest).That is a brief description of how your Fishfinder 160C operates.The following pages show how this data can help you to improveyour fishing.This fish is currently in a dead zone and is not detected by thesonar. The fish is in the coverage area of the transducer, butremember—the first strong return sets the bottom level. The fishwill eventually be detected when the first strong return sets thebottom level below the fish.112233