Garmin Fishfinder 340C Owner's Manual page 42

U F 340C > U
SING THE ISHFINDER
Off (default)—all high-intensity bottom returns appear as a
solid color.
Whiteline Turned On
On—the strongest signal from the bottom appears as a bright
color.
• Frequency—only appears when using a dual frequency
transducer. This allows you to choose a sonar operation
frequency. You can choose 200 kHz, 50 kHz, or Dual
frequency (to alternate between the two frequencies).
• Scroll—adjusts the rate at which the Sonar Pages scroll
from right to left. Ultrascroll (default) is used when you
select a scroll rate from 90% to 100%. Auto automatically
adjusts the scroll rate according to the boat's speed. (See also
"Automatic Scroll Speed Limit" on
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A M
SING THE DJUSTMENT ENU
Whiteline Turned Off
page 28.)
• Depth Line—adds a horizontal depth line across the screen
that is used to measure the depth of underwater objects. The
depth of the line appears on the right side of the line. Press
up or down on the ROCKER to control the position of the
line on the Sonar Pages. Move the slider to the top to turn off
Depth Line.
• Zoom—sets a screen zoom scale. The following settings are
available:
Off—turns off the Zoom function.
2x Zoom––increases the graph zoom level 2x.
4x Zoom––increases the graph zoom level 4x.
Btm (Bottom) Lock––sets the Bottom Lock (returns from
the bottom up) picture. When using this setting, "BL"
appears at the bottom of the screen.
• Zoom View—available when you select a Zoom scale other
than Off. You can use the Zoom View setting to change the
viewing range of a zoomed display. Auto follows the water
bottom. If you select Bottom Lock, use the Span setting to
adjust how far off the bottom the Fishfinder shows data.
Fishfinder 340C Owner's Manual