Garmin 278 Manual De Usuario

Use the Sonar tab on the Main Menu to set up the Sonar Page. 

Fish Symbols—select how the Sonar Page shows underwater targets 

and background information. Select Off to show all of the available 

information about the underwater environment. Select a fish symbol, 

to show only the information related to that symbol.
Water Type—select the proper water type you are boating in. 

Because 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 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 appears 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 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 you 

are using a speed-capable transducer/sensor, select Temp, Spd. 

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