Garmin 188c Manual De Usuario

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Whiteline—controls how the unit displays 

information about the bottom type (hard or soft). 

With the Whiteline Off, the bottom return displays 

as red and contains no information on bottom 

hardness. With Whiteline set at Normal or 1-100%, 

the bottom return becomes white with a red line 

indicating where the water meets the bottom. To 

turn the Whiteline Off, press the 

ROCKER down 

until the setting bar is all the way at the bottom 

of the range and reads Off. See 

page 91

 for more 

detail on this feature. 

Frequency—allows you to choose a transducer 

frequency. Frequency refers to the pitch of the 

sound that the transducer sends and receives. You 

can choose 200kHz, 50kHz, or Dual frequency. 

Depth Line—adds a horizontal depth line across 

the display that is used to measure the depth of 

underwater objects. The depth of the line appears 

in a box on the right side of the line. Press up or 

down on the ROCKER to control the position of 

the line on the graph. The depth is displayed in a 

window on the right side of the line. To turn the 

Depth Line Off, press the ROCKER up until the 

setting bar is all the way at the top of the range 

and reads Off.

Noise Reject—helps filter unwanted noise from 

the graph. The Noise Reject tool can be turned Off, 

set to Normal (automatically adjusts for optimum 

viewing), or to a fixed 1-100% setting. When 

setting the Noise Reject tool, the HIGHER the 

noise rejection setting, the less likely the unit is 

to NOT show fish or structures. To turn the Noise 

Reject Off, press the 

ROCKER down until the 

setting bar is all the way at the bottom of the range 

and reads Off.