Garmin GPSMAP 296 用户手册

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.

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.

Depth Number—select how efficient the digital depth update rate 

is. Fast Sonar update updates quicker and is recommended for low-

noise 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. 
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. 

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