Справочник Пользователя для Garmin gpsmap 298

U

SING

 S

ONAR

 > 

U

NDERSTANDING

 S

ONAR

Scale—controls the depth Scale shows vertically along the right 

side of the graph. The depth Scale can be configured to show four 

different ways: as an Overlay, in the Corners, with Basic, or No 

Scale.
Custom Range—allows you to specify a custom viewing range 

or scale. When On, this range appears as Custom in the Range 

setting. The left value is the top of the scale and the right value is 

the bottom of the scale.
Water Temperature and Water Speed—hides or shows 

temperature and water speed on the Sonar Page. When set to Auto, 

the unit automatically shows this information, only if it is received 

from the transducer.
Color Scheme—sets the color on the Sonar Page.

  NOTE: 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. 

 

The transducer mounted on your vessel transmits sound waves 

toward the bottom of a lake, stream, or seabed in a cone-shaped 

pattern. When a transmitted sound wave strikes an underwater 

object—such as the bottom, a piece of structure, or a fish—sound 

is reflected back to the transducer. The transducer collects the 

reflected sound waves and sends the data to the GPSMAP 292/298 

to process and show. The underwater data is shown on the Sonar 

Page in the order that it is returned: first returned is the first on the 

screen. 
Generally speaking, if the only thing between the transducer and 

the bottom is water, the first strong return comes from the bottom 

directly below the transducer and sets the bottom level. Weaker 

secondary returns provide the detailed data. Stronger returns show 

in darker colors, with the most intense color for the color scheme 

selected (default is red) being the strongest return.