Garmin GPSMAP 192C Owner's Manual page 88

U S > S P
SING ONAR ONAR AGE
Target Level—adjusts how dark or light a return (or target) is
displayed on-screen. A Color Bar (see page 87) appears on the
right side of the screen as you adjust this setting. The higher the
percentage, the darker the return appears. This setting does not
increase or decrease the unit Gain.
Target Level Selection
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 92 for more detail on this feature.
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Whiteline Adjustment
Frequency—allows you to choose a transducer frequency.
Frequency refers to the pitch of the sound that the transducer sends
and receives. Choose between 200kHz, 50kHz, or Dual frequency.
Frequency Adjustment
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.
GPSMAP 192C Owner's Manual