Setting up the SonarUse the Setup tab in the Main Menu to set up the Sonar page. PressMENU two times to open the Main Menu. Select Setup from thevertical row of tabs on the left, then select Sonar Setup from therow of tabs along the top of the screen.Sonar Setup Tab of the Main MenuFish Symbols—select how the Sonar page displays underwatertargets and background information. If you select Off, the unitdisplays all of the available information about the underwaterenvironment. If you select a fish symbol, the Sonar page displaysonly the information related to that symbol.Water Type—select the proper water type you are boating in. Sincesound waves travel through Fresh and Salt water at different rates, itis necessary to select the Water Type to ensure accurate readings onthe unit.Depth Number—select how efficient the digital depth update rateis. Fast Sonar Update updates quicker and is recommended forlow-noise water deeper than 50 feet. Auto is best for shallow wateror high-noise areas, has a slower screen update, and is best used ifyou travel a wide variety of depths.If the unit is unable to track the bottom for any reason, the digits inthe depth window flash on and off to alert you that the unit is nottracking the bottom.Map Split Sonar Detail—select how much detail is displayed onthe Map page with the sonar displayed. Full Range shows datausing the Range setting of the Sonar page, regardless of Zoom orBottom Lock. Maximum Detail shows any Zoom or Bottom Lockdata from the Sonar page.Keel Offset—enter the surface reading for the depth of a keel. Thismakes it possible to measure depth from the bottom of your keelinstead of from the transducer’s location. Enter a positive numberto offset for a keel. It is also possible to enter a negative number tocompensate for a large vessel that may draw several feet of water.The Keel Offset is reflected in the depth reading.Transducer—select the type of transducer that you are using. If youare using a speed-capable transducer/sensor, select Temp, Spd.96 GPSMAP 276C Owner’s ManualSETTING UP AND USING SONAR > SETTING UP THE SONAR
