Garmin Fishfinder 140 Owner's Manual

Also see for Fishfinder 140: Owner's manual Install guide Owner's manual Declaration of conformity Manual

Contents

Garmin Fishfinder 140 Owner's Manual Manual pdf 7 page image

Fishfinder 90/140 Owner’s Manual 1GETTING STARTEDGETTING STARTEDTo get the most out of your new Fishfinder:• Before you install and use your Fishfinder, read andlearn the information in this manual.• Assemble and install the hardware (page 4).• Practice using your Fishfinder in simulator mode(page 3).• Use the Fishfinder (page 12).Understanding SonarThe transducer that you mount on your vessel sendssound waves toward the bottom of the water in a cone-shaped pattern. When a sound wave strikes an underwaterobject (such as the bottom, a structure, or a fish), sound isreflected back to the transducer. The transducer collects thereflected sound waves and sends the data to the Fishfinderto be processed and shown on the screen. The underwaterdata is shown on the screen in the order that it is returned;the first returned is the first on the screen.Generally speaking, if the only thing between thetransducer and the bottom is water, the first strong returncomes from the bottom directly below the transducer,and this sets the bottom level. Weaker secondary returnsprovide the detailed data. Stronger returns appear in darkerhues.Understanding the Fishfinder ScreenThe transducer sends a beam down to the bottom of thewater, much like the beam of a flashlight. The beam startssmall near your vessel and expands as it gets to the bottom.The Fishfinder screen does not display a three-dimensionalrepresentation of the underwater environment; the screenis in two dimensions, much like if you took a pictureof an aquarium. Only the depth of the item in the waterappears. The screen does not show you where an item islocated horizontally in the water, as shown in the followingdrawings. The fish is not directly above the tree in reality,but it might look like it is on the Fishfinder screen.