Garmin echoMAP CHIRP 40 SERIES Owner's Manual

Also see for echoMAP CHIRP 70 series: Owner's manual Installation instructions

penetration. They can be used to search for structures such asbrush piles.A CHIRP frequency has a better resolution than traditional sonarfrequencies, and displays some smaller targets more clearly.When the CHIRP frequency is set to high, the screen displaysreduced thermocline. When the CHIRP frequency is set to low,larger targets are more visible.Viewing two frequencies at the same time using the splitfrequency view allows you to see deeper with the lowerfrequency return and to see more detail with the higherfrequency return.Selecting FrequenciesNOTE: You cannot adjust the frequency for all sonar views andtransducers.You can indicate which frequencies appear on the sonar screen.1 From a sonar view, select MENU > Frequency.2 Select a frequency suited to your needs and water depth.For more information on frequencies, see SonarFrequencies, page 17.Creating a Frequency PresetNOTE: Not available with all transducers.You can create a preset to save a specific sonar frequency,which allows you to change frequencies quickly.1 From a sonar view, select MENU > Frequency.2 Select Add.3 Enter a frequency.Turning On the A-ScopeNOTE: This feature is not available in all sonar views.The a-scope is a vertical flasher along the right side of the full-screen sonar view. This feature expands the most recentlyreceived sonar data so that it is easier to see. It can also behelpful for detecting fish that are close to the bottom.From a sonar view, select MENU > Sonar Setup >Appearance > A-Scope.Sonar SetupSonar SettingsNOTE: Not all options and settings apply to all models, soundermodules, and transducers.From a sonar view, select MENU > Sonar Setup.Depth Line: Shows a quick-reference depth line.Scroll Speed: Sets the rate at which the sonar scrolls from rightto left.In shallow water you might want to slow the scroll speed toextend the length of time the information is displayed onscreen. In deeper water you can increase the scroll speed.Range Lines: Shows the vertical lines indicating the distance tothe right and left of the boat. This setting is available forSideVü sonar view.Color Scheme: Sets the color scheme of the sonar view. Thissetting might be available in the Appearance menu.The high contrast color schemes provide darker colorassignments to the low intensity returns. The low contrastcolor schemes provide color assignments to the low intensityreturns that are similar to the background color.Appearance: See Sonar Appearance Settings, page 18.Overlay Numbers: Sets the data shown on the sonar screen.Advanced: See Advanced Sonar Settings, page 18.Installation: Restores the default sonar settings.Sonar Appearance SettingsFrom a sonar view, select MENU > Sonar Setup >Appearance.Color Scheme: Sets the color scheme.Edge: Highlights the strongest signal from the bottom to helpdefine the hardness or softness of the signal.A-Scope: Displays a vertical flasher along the right side of thescreen that shows instantaneously the range to targets alonga scale.Pic. Advance: Allows the sonar picture to advance faster bydrawing more than one column of data on the screen foreach column of sounder data received. This is especiallyhelpful when you are using the sounder in deep water,because the sonar signal takes longer to travel to the waterbottom and back to the transducer.The 1/1 setting draws one column of information on thescreen per sounder return. The 2/1 setting draws twocolumns of information on the screen per sounder return, andso on for the 4/1 and 8/1 settings.Fish Symbols: Sets how the sonar interprets suspendedtargets.Advanced Sonar SettingsFrom a sonar view, select MENU > Sonar Setup > Advanced.Interference: Adjusts the sensitivity to reduce the effects ofinterference from nearby sources of noise.The lowest interference setting that achieves the desiredimprovement should be used to remove interference from thescreen. Correcting installation issues that cause noise is thebest way to eliminate interference.Surface Noise: Hides surface noise to help reduce clutter.Wider beam widths (lower frequencies) can show moretargets, but can generate more surface noise.Color Gain: See Adjusting the Level of Detail, page 17.TVG: Adjusts the appearance of returns to compensate forweakened sonar signals in deeper water, and reduces theappearance of noise near the surface. When the value of thissetting is increased, the colors associated with low-levelnoise and fish targets appear more consistent throughvarious water depths. This setting also reduces the noisenear the surface of the water.Transducer Installation SettingsFrom a sonar view, select MENU > Sonar Setup > Installation.Restore Sonar Defaults: Restores the factory default settingsfor the sonar view.Transducer Type: Allows you to select the type of transducerthat is connected to the device.Shift: Allows you to set the depth range on which the sonar isfocused. This enables you to zoom in to an area within thefocused depth.Flip Left/Right: Changes the orientation of the SideVü sonarview when the transducer is installed backward.Flipped: Sets the orientation of the Panoptix sonar view whenthe transducer is installed with the cables pointing toward theport side of the boat.Beam Width: Sets the width of the Panoptix transducer beam.Narrow beam widths are better for high-speed operation andrough sea conditions. They also can improve bottomdefinition and thermocline definition.Wider beam widths generate larger arches for fish targetreturns, making them ideal for locating fish. Wider beamwidths also perform better in deep water, because the lower18 Sonar