Garmin GPSMAP 496 - Aviation GPS Receiver Owner's Manual page 130

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Zoom—used to quickly select a zoom scale or to split the screen.
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 levels:
• 2X Split—shows two reduced-size sonar pictures at the same
time. The right half of the screen 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.
notE: Quickly zoom in and out of the Sonar Page by pressing
the in and out keys. Stop the zoom function by pressing the
out key until the no Zoom setting appears.
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View/Span—available when a Zoom scale other than no Zoom is
selected. The View or Span setting is used to change the viewing range
of a zoomed screen. If the screen is 2X or 4X split, only the zoomed
portion on the left side of the screen is affected by the change. If the
screen is Bottom Split or Bottom Lock, Span adjusts how far off the
bottom the unit shows data.
gain—allows you to control the sensitivity of the unit's receiver,
which provides flexibility in what is shown. 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 show 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 screen. A lower percentage
results in more weaker-signaled colors shown on the sonar screen.
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 the Whiteline Off, the bottom return
shows as red. Set Whiteline at normal or 1–100% to determine
bottom hardness. See page 129
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 496 Owner's Manual