14.1 Fishfinder introductionWarning: Sonar operation• NEVER operate the sounder with the boat out ofthe water.• NEVER touch the transducer face when the sounderis powered on.• SWITCH OFF the sounder if divers are likely to bewithin 7.6 m (25 ft) of the transducer.Fishfinder overviewThe fishfinder application provides a detailed view of the fish andseabed under your vessel, enabling you to accurately distinguishbetween different sizes of fish, bottom structure, and underwaterobstacles. The standard fishfinder image is a historical, scrollingbottom graph with range and sonar frequency automatically selectedby the system.The various functions and features of the fishfinder applicationinclude:• Preset modes for easy optimal operation.• Display modes (Zoom, A-Scope or Bottom Lock).• Adjustable range and zoom.• Finding bottom feeding fish with the bottom lock display mode.• Clutter and gain options to simplify the image.• Pausing and adjusting the speed of the scrolling image.• Using waypoints to mark a position.• Determining depths and distances of targets.• Fishfinder alarms (fish, depth or water temperature).Fishfinder screenThe fishfinder displays a scrolling image of the seabed, updatingfrom the right as your vessel makes progress.Example fishfinder screenThe fishfinder window includes the following aspects:• The bottom together with any bottom structure such as reefs andshipwrecks etc.• Target images indicating fish.• A status bar noting the frequency and gain settings.• The bottom depth.Status iconThe fishfinder status icon is located on the Status icon bar:• Icon animated - fishfinder is operating.• Icon static - the fishfinder transducer is connected but nottransmitting.• Icon greyed-out - no fishfinder transducer is connected.How the fishfinder worksThe fishfinder application uses a Digital Sounder Module (DSM) anda suitable sonar transducer. The DSM interprets signals from thetransducer and builds up a detailed underwater view.The transducer is located on the bottom of the boat, it sends pulsesof sound waves into the water and measures the time it takes for thesound wave to travel to the bottom and back. The returning echoesare affected by bottom structure and by any other objects in theirpath, for example reefs, wrecks, shoals or fish.Colors are used on the display to indicate the strength of the returns.You can use this information to determine the bottom structure,the size of fish and other objects in the water, such as debris orair bubblesNote: Some transducers include additional sensors to measurewater temperature and/or speed.Fishfinder context menuThe fishfinder application includes a context menu which providesfishfinder information and menu items.The fishfinder context menu can be accessed by:• Selecting a location using the Joystick and pressing the Okbutton, or• Selecting and holding on an area on screen — Hybridtouchmultifunction displays only.The context menu provides the data for the position of the cursor:• Range• DepthThe context menu also provide the following menu items:• Place Waypoint• Place MarkerThe menu items can be accessed:• using the Rotary Control and Ok button, or• selecting the menu item on screen — Hybridtouch multifunctiondisplays only.158 e7 / e7D / e95 / e97 / e125 / e127 / c95 / c97 / c125 / c127
