Garmin GPSMAP 496 Manuel d'utilisateur télécharger pdf (Page 146)

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.

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 145 for more information.

Frequency—allows you to choose a transducer frequency.

Frequency refers to the “pitch” of the sound that the transducer

sends and receives.

138 GPSMAP 496 Owner’s Manual

SETTING UP AND USING SONAR > USING THE SONAR PAGE

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Garmin GPSMAP 496 Manuel d'utilisateur Page 146

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