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74 GPSMAP 292/298 Owner’s Manual
USING SONAR > SONAR PAGE
Color Gain—controls what colors are applied to the objects on
the screen. Color DCG is based on depth and makes it easier to
spot subtle changes in bottom conditions or fish sizes. DynaColor
(default) represents the latest in sonar data presentation and is
recommended for all applications. The presentation is based on
bottom strength. It makes the bottom and the fish easier to see and
requires fewer adjustments.
Whiteline—controls how the unit shows information about the
bottom type (hard or soft). With the Whiteline Off, the bottom
return shows 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, in the default color scheme,
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 83 for more detail
on this feature.
Frequency—allows you to choose a transducer frequency.
Frequency refers to the pitch of the sound that the transducer sends
and receives. You can choose 200kHz, 50kHz, or Dual frequency.
This option is only available if you have a dual frequency
transducer installed.
UltraScroll/Scroll—adjusts the rate at which the Sonar Pages
scroll from right to left. Ultrascroll (the 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 page 78.)
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 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 shows 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.
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