0 GPSMAP ® 6000/7000 Series Owner’s ManualSonarSetting the Color SchemeYou can set the color scheme for all sonar screens.1. From the Home screen, select Sonar > Sonar Setup > Appearance.2. Complete an action:Select Color Scheme > Blue.Select Color Scheme > White.Adjusting the Gain on the Sonar ScreenYou can control the sensitivity of the sonar receiver. To see more detail, increase the gain. If thescreen is cluttered, decrease the gain.1. From the Home screen, select Sonar.2. Select a sonar view.3. Select Menu > Gain.4. Complete an action:Select Auto to allow the chartplotter to adjust the gain automatically.Select Up or Down to increase or decrease the gain manually.5. Select Done.Adjusting the Noise Rejection on the Sonar ScreenThe Noise Rejection setting appears only when you have manually increased or decreased the gainsetting (page 104).You can minimize the appearance of weak sonar returns by increasing the noise rejection.1. From the Home screen, select Sonar.2. Select a sonar view.3. Select Menu > Noise Reject.4. Select Up or Down.Selecting FrequenciesYou can indicate which frequencies appear on the sonar screen when using a dual frequencytransducer. You can show data from a 200 kHz sonar signal, data from a 50 kHz sonar signal, or datafrom both signals simultaneously.1. From the Home screen, select Sonar.2. Select a sonar view.3. Select Menu > Frequency.4. Complete an action:Select 200 kHz to show data from a 200 kHz sonar signal. This is useful mainly for moreshallow, inland waters.Select 50 kHz to show data from a 50 kHz sonar signal. This is useful mainly for deeperwaters.Select Dual to show both 200 kHz and 50 kHz data.•••••••
