Koden CVS-128 - Changing of Image Speed; Rejection of Interference; Interference Rejection

Chapter 2 How to use the menu CVS-128/128B
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(It can be displayed by rotating the [GAIN
(HF) Knob] or [GAIN (LF) Knob])
7 To select the other menu item, press the
[
] key.
The cursor returns to the menu column.
8 Press the [MENU] key to close the menu.
2.2 Changing of Image Speed
The image speed of echo sounder can be
changed. Even if the schools of fish and bottom
are same, the image changes depending on the
image speed.
The image speed becomes slow in the order of
[Speed1] [Speed2]····· [Speed9].
When [stop] is selected, the image stops.
Caution: When the fish symbol function
is made effective, the image speed
becomes 2 kinds ([Speed5 (1/1)] or
[Stop]).
1 Press the [MENU] key.
2 Select the [Adjust]  [Image Speed]. (See
[2.1 How to operate the menu].)
3 Press the [ ] key.
4 Change the setting of [Image Speed].
(Press the [
] key or [ ] key.)
5 Press the [MENU] key to close the menu.
2.3 Rejection of Interference
Interference Rejection
The interference noise from the echo sounder
of other boats can be reduced.
If a neighboring boat uses the echo sounder
having the same frequency and pulse
transmission rate as those your boat has, the
interference noise may be displayed. If you set
the interference rejection, the interference
noise can be reduced. In the order of weak 
strong, the noise rejection capability becomes
high.
The difference of images based on the different
settings of [Intererence reduction]
1 Press the [MENU] key.
2 Select the [Adjust]  [Interference Rejection].
(See [2.1 How to operate the menu].)
3 Press the [ ] key.
4 Change the setting of [Inference Rejection].
(Press the [
] key or [ ] key.)
IR
OFF
Weak
Strong
5 Press the [MENU] key to close the menu.
Speed 1
Speed 2
Speed 3
Speed 4
Stop
Speed 5 (1/1)
Speed 6
Speed 7
Speed 8
Speed 9
OFF
Weak
Strong
Image of school of fish
Interference image
Image speed