Garmin GPSMAP 376C Owner's Manual page 114

S U S >
ETTING UP AND SING ONAR
Zoom—allows you to quickly select a display zoom scale or to
split the display. When a scale other than No Zoom is selected, the
Adjustment Menu shows a new selection labeled View or Span. The
Zoom function is divided into six display levels:
• 2X Split—shows two reduced-size sonar pictures at the same
time. The right half of the display shows the complete sonar
picture at its original scale. The left half shows a portion of
the original picture at 1/2 depth scale.
• 2X Zoom—shows the 2X zoomed picture on the full screen.
• 4X Split—shows two reduced pictures, the right at the
original depth scale and the left at 1/4 the original depth scale.
• 4X Zoom—shows the 4X zoomed picture on the full screen.
• Btm (Bottom) Split—shows two reduced pictures, the right
at the original depth scale and the left showing sonar returns
from the bottom up. All target depths read as a distance from
the bottom.
• Btm (Bottom) Lock—shows returns from the bottom up on
the full screen.
TIP: Quickly zoom in and out of the Sonar display by pressing
the IN and OUT keys. Turn off the zoom function by pressing the
OUT key until the No Zoom setting appears.
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SING THE ONAR AGE
View/Span—changes the viewing range of a zoomed display. If the
display is 2X or 4X split, only the zoomed portion on the left side of
the display is affected by the change. If the display is Bottom Split
or Bottom Lock, Span adjusts how far off the bottom the unit shows
data. This option is available when a Zoom scale other than No
Zoom is selected.
Gain—allows you to control the sensitivity of the unit's receiver,
which provides flexibility in what appears. To see more detail,
increase the receiver sensitivity by selecting a higher gain. If there is
too much detail or if the screen is cluttered, select a lower gain.
Target Level—adjusts which colors are used to display sonar
information. A Color Bar appears on the right side of the screen as
you adjust this setting. A higher percentage results in more strong-
signaled colors shown on the sonar display. A lower percentage
results in more weaker-signaled colors shown on the sonar display.
This setting does not increase or decrease the unit Gain.
Whiteline—controls how the unit shows information about the
bottom type (hard or soft). With Whiteline Off, the bottom return
shows as red. Set Whiteline at Normal or 1–100% to determine
bottom hardness. See page 114
Frequency—allows you to choose a transducer frequency.
Frequency refers to the "pitch" of the sound that the transducer
sends and receives.
for more information.
GPSMAP 376C Owner's Manual