Garmin GPSMAP 396 Owner's Manual - Page 147
Setting Up the Sonar Map Split Sonar Detail
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Setting up and Using Sonar > Setting up the Sonar Page Setting Up the Sonar Page Use the Sonar tab in the Main Menu to set up the Sonar Page. Press Menu two times to open the Main Menu. Select Sonar from the vertical row of tabs on the left, then select Setup from the row of tabs along the top of the screen. Depth Number-select how efficient the digital depth update rate is. Fast Sonar update updates quicker and is recommended for lownoise water deeper than 50 feet. Auto is best for shallow water or high-noise areas, has a slower screen update, and is best used if you travel a wide variety of depths. If the unit is unable to track the bottom for any reason, the digits in the depth window flash on and off to alert you that the unit is not tracking the bottom. Sonar Tab of the Main Menu Fish Symbols-select how the Sonar Page shows underwater targets and background information. If you select Off, the unit shows all of the available information about the underwater environment. If you select a fish symbol, the Sonar Page shows only the information related to that symbol. Water Type-select the proper water type you are boating in. Since sound waves travel through Fresh and Salt water at different rates, it is necessary to select the Water Type to ensure accurate readings on the unit. Map Split Sonar Detail-select how much detail is shown on the Map Page with the sonar shown. Full Range shows data using the Range setting of the Sonar Page, regardless of Zoom or Bottom Lock. Maximum Detail shows any Zoom or Bottom Lock data from the Sonar Page. Keel Offset-enter the surface reading for the depth of a keel. This makes it possible to measure depth from the bottom of your keel instead of from the transducer's location. Enter a positive number to offset for a keel. It is also possible to enter a negative number to compensate for a large vessel that draws several feet of water. The Keel Offset is reflected in the depth reading. Transducer-select the type of transducer that you are using. If you are using a speed-capable transducer/sensor, select Temp, Spd. GPSMAP 396 Owner's Manual 139