Garmin GPSMAP 276C Owner's Manual

Also see for GPSMAP 276C: Owner's manual Owner's manual Quick reference guide Declaration of conformity Owner's manual

Contents

Setting Up SonarUse the Sonar tab on the Main Menu to set up the Sonar Page.To access the Sonar Tab:Highlight the Sonar tab on the Main Menu.Main Menu—Sonar TabFish Symbols—select how the Sonar Page shows underwater targetsand background information. Select Off to show all of the availableinformation about the underwater environment. Select a fish symbolto show only the information related to that symbol.Water Type—select the proper water type in which you are boating.Because sound waves travel through fresh and salt water at differentrates, it is necessary to select the Water Type to ensure accuratereadings on the unit.Depth Number—select the efficiency of the digital depth updaterate. Fast Update updates quicker and is recommended for low-noise water deeper than 50 feet. Auto is best for shallow water orhigh-noise areas, has a slower screen update, and is best used if youtravel 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 appears on theMap Page with the sonar shown. Full Range shows data using theRange setting of the Sonar Page, regardless of Zoom or BottomLock. Maximum Detail shows any Zoom or Bottom Lock datafrom 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 can 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. GPSMAP 276C Owner’s ManualsettIng uP And usIng sonAr > settIng uP sonAr