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• Select Auto to have the scroll speed automatically adjust to the water speed of your boat, if you are using a water-speed sensor or a speed-capable transducer. 74 GPSMAP 700 Series Owner’s Manual Sonar Showing Surface Noise You can set whether the sonar returns near the surface of the water appear. Hide surface noise to help reduce clutter. From the Home screen, select Sonar > Sonar Setup > Surface Noise > Show. Showing and Configuring a Depth Line You can set whether a quick-reference depth line appears. 1. From the Home screen, select Sonar > Sonar Setup > Depth Line > Show. 2. Touch and drag the reference line to set the depth of the line. Showing the A-Scope The A-Scope is a vertical flasher along the right side of the screen that shows instantaneously the range to targets along a scale. From the Home screen, select Sonar > Sonar Setup > A-Scope > on. Setting Pic Advance The picture advance setting allows the sonar picture to advance faster by drawing more than one column of data on the screen for each column of sounder data received. This is especially helpful when you are using the sounder in deep water, because the sonar signal takes longer to travel to the water bottom and back to the transducer. The 1/1 setting draws one column of information on the screen per sounder return. The 2/1 setting draws two columns of information on the screen per sounder return, and so on for the 4/1 and 8/1 settings. 1. From the Home screen, select Sonar > Sonar Setup > Pic. Advance. 2. Select a picture advance setting. Showing Overlay Numbers You must have a water-speed sensor or a speed-capable transducer to show water-speed information, and you must have a water-temperature sensor or a temperature-capable transducer to show water-temperature information. You can set water temperature, unit voltage, water speed (if your transducer is capable), and navigation information to appear automatically on the Sonar screens. The navigation information always includes GPS speed and GPS heading, and includes bearing and off-course information while navigating. 1. From the Home screen, select Sonar > Sonar Setup > overlay Numbers. 2. Complete an action: • Select Depth > Show. • Select Water Temp > Auto. • Select Water Speed > Auto. • Select Unit Voltage > Show. • Select Navigation > Auto. If you select Auto, and if the information is available, the data appears on the Sonar screen. Configuring the Appearance of Suspended Targets You can set how the sonar interprets suspended targets. 1. From the Home screen, select Sonar > Sonar Setup > Appearance > Fish Symbols. 2. Complete an action: • Select to show suspended targets as symbols with background sonar information. • Select to show suspended targets as symbols with background sonar information and target depth information. • Select to show suspended targets as symbols. • Select to show suspended targets as symbols with target depth information. GPSMAP 700 Series Owner’s Manual 75 Sonar Showing and Configuring the Whiteline You can highlight the strongest signal from the bottom to help define the hardness or softness of the signal. 1. From the Home screen, select Sonar > Sonar Setup > Whiteline. 2. Complete an action: • Select High to turn on the whiteline with the most-sensitive setting. Almost all strong returns are highlighted in white. • Select Medium to turn on the whiteline with many strong returns highlighted in white. • Select Low to turn on the whiteline with the least-sensitive setting. Only the strongest returns are highlighted in white. Setting the Color Scheme 1. From the Home screen, select Sonar > Sonar Setup. 2. Complete an action: • Select Color Scheme > Blue. • Select Color Scheme > White. Adjusting the Gain on the Sonar Screen You can control the sensitivity of the sonar receiver. To see more detail, increase the gain. If the screen 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 Screen The Noise Rejection setting appears only when you have manually increased or decreased the gain setting (page 76). 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 Frequencies You can indicate which frequencies appear on the sonar screen when using a dual frequency transducer. You can show data from a 200 kHz sonar signal, data from a 50 kHz sonar signal, or data from 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 more-shallow, inland waters. • Select 5...

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