Garmin ECHOMAP PLUS 40 Series Owner's Manual

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using a fixed frequency, you should consider your goals andwater conditions when using CHIRP frequencies.Some sonar black boxes and transducers also provide the abilityto customize preset frequencies for each transducer element,which enables you to change the frequency quickly using thepresets as the water and your goals change.Viewing two frequencies concurrently using the split-frequencyview allows you to see deeper with the lower frequency returnand, at the same time, see more detail from the higherfrequency return.Selecting the Transducer FrequencyNOTE: You cannot adjust the frequency for all sonar views andtransducers.You can select which frequencies appear on the sonar screen.NOTICEAlways be aware of local regulations on sonar frequencies. Forexample, to protect orca whale pods, you might be prohibitedfrom using frequencies between 50 to 80 khz with in ½ mile ofan orca whale pod. It is your responsibility to use the device incompliance with all applicable laws and ordinances.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 23.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 available in the Traditional sonar views.The a-scope is a vertical flasher along the right side of the view,showing you what is underneath the transducer right now. Youcan use the a-scope to identify target returns that may bemissed when the sonar data is quickly scrolling across thescreen, such as when your boat is moving at high speeds. It canalso be helpful for detecting fish that are close to the bottom.The a-scope above shows fish returns and a soft bottomreturn .From a sonar view, select MENU > Sonar Setup >Appearance > A-Scope.Panoptix Sonar SetupAdjusting the RealVü Viewing Angle and Zoom LevelYou can change the viewing angle of the RealVü sonar views.You can also zoom in and out of the view.From a RealVü sonar view, select an option:• To adjust the viewing angle, use the arrow keys.• To zoom in and out, turn the knob.Adjusting the RealVü Sweep SpeedYou can update how quickly the transducer sweeps back andforth. A faster sweep rate creates a less detailed image, but thescreen refreshes faster. A slower sweep rate creates a moredetailed image, but the screen refreshes more slowly.NOTE: This feature is not available for the RealVü 3D Historicalsonar view.1 From a RealVü sonar view, select MENU > Sweep Speed.2 Select an option.LiveVü Forward and FrontVü Sonar MenuFrom the LiveVü Forward or FrontVü sonar view, select MENU.Gain: Controls the level of detail and noise shown on the sonarscreen.If you want to see the highest intensity signal returns on thescreen, you can lower the gain to remove lower intensityreturns and noise. If you want to see all return information,you can increase the gain to see more information on thescreen. This also increases noise, and can make it moredifficult to recognize actual returns.Depth Range: Adjusts the range of the depth scale.Allowing the device to adjust the range automatically keepsthe bottom within the lower portion of the sonar screen, andcan be useful for tracking a bottom that has minimal ormoderate terrain changes.Manually adjusting the range enables you to view a specifiedrange, which can be useful for tracking a bottom that haslarge terrain changes, such as a drop-offs or cliffs. Thebottom can appear on the screen as long as it appears withinthe range you have set.Forward Range: Adjusts the range of the forward scale.Allowing the device to adjust the range automatically adjuststhe forward scale in relation to the depth. Manually adjustingthe range enables you to view a specified range. The bottomcan appear on the screen as long as it appears within therange you have set. Manually reducing this option can reducethe effectiveness of the FrontVü Alarm, reducing yourreaction time to low depth readings.Transmit Angle: Adjusts the focus of the transducer to the portor starboard side. This feature is available only with RealVücapable Panoptix transducers, such as the PS30, PS31, andPS60.Sonar Transmit: Stops the active transducer from transmitting.FrontVü Alarm: Sets an alarm to sound when the depth in frontof the vessel is less than the specified value (Setting theFrontVü Depth Alarm, page 24). This is available only withPanoptix FrontVü transducers.Sonar Setup: Adjusts the setup of the transducer and theappearance of the sonar returns.Setting the LiveVü and FrontVü Transducer Transmit AngleThis feature is available only with RealVü capable Panoptixtransducers, such as the PS30, PS31, and PS60.You can change the transducer transmit angle to aim thetransducer at a particular area of interest. For example, youmight aim the transducer to follow a bait ball or focus on a treeas you pass it.1 From a LiveVü or FrontVü sonar view, select MENU >Transmit Angle.2 Select an option.Setting the FrontVü Depth AlarmWARNINGThe FrontVü depth alarm is a tool for situational awareness only,and may not prevent groundings in all circumstances. It is the24 Sonar Fishfinder