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46 DS400 and DS500 Digital Fishfinders
• AUTOMATIC enables the digital fishfinder to determine the optimum fre-
quency based on the current conditions.
• 200 kHz MAN fixes the frequency at 200kHz no matter what depth you are
viewing. This frequency is typically used for shallower water and a more
detailed view. When using this frequency, the transducer scans a nar-
rower area, but produces a more detailed view. The 200 kHz signal is
good for finding fish near the bottom or close together. It is better for use
in shallow water.
• 50 kHz MAN fixes the frequency at 50kHz no matter the depth. This fre-
quency is typically used for wide coverage and deep water. When using
this frequency, the transducer scans a wide area. The 50 kHz signal pene-
trates water well, so is good for use in deep water.
• DUAL MAN displays separate screens for both 50 and 200kHz. The trans-
ducer can operate in both 50 kHz and 200 kHz frequencies at the same
time. If you choose dual frequency operation, the scrolling bottom dis-
play is split vertically; the left half shows the 200 kHz detailed view and
the right half shows the 50 kHz image.
The default setting is AUTOMATIC.
A-Scope
Use the A-Scope screen to show raw sonar data directly from the transducer
beam. This gives you a “real time” image of fish and bottom structure
directly below the transducer. This function is very useful in showing the
strength of the echo returned from a fish. The display is split vertically, with
the A-Scope image in the right hand window and the scrolling bottom image
in the left hand window.
Select one of the three modes for A-Scope, as demonstrated in Figure 4-2 :
• OFF, in which A-Scope does not appear.
• ON-1, in which the image takes up the entire A-Scope window.
• ON-2, in which only the left side of the image displayed in Mode ON-1
expands to the entire A-Scope window. This mode provides the greatest res-
olution.
• ON-3, in which the A-Scope image is angled outward as the signal width
(indicated with dotted lines) increases with depth.
The default setting is OFF.