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2
rSOUNDER MODEq SELECTION OF FREQUENCY
(2) Selection of Frequency
(3) STC; Setting of Immunity
to Air Bubbles
To select the Sounder frequency between “High (H)” and “Low (L)”, proceed
as follows. (Default; H)
q Press the [MENU] key.
The Main Menu screen will appear.
w Select “Sounder Menu” using the [UP] or [DOWN] key and press the [SET] key.
The Sounder Menu screen will appear.
e Select “Frequency” using the [UP] or [DOWN] key and press the [SET] key.
The selected item turns blue.
r Select “Ò” (50 kHz) or “Ó” (200 kHz) using the [LEFT] or [RIGHT] key and press
the [SET] key.
The selected frequency will be indicated in the frequency field on fishfinder
screens.
t When you finish selecting the frequency, press the [MENU] key to close the Main
Menu screen.
The following table summarizes characteristics and main applications of the low
and high frequencies.
To set the immunity to air bubbles in the sea surfaces so as to improve the
image legibility, proceed as follows. (Default; 1)
q Press the [MENU] key.
The Main Menu screen will appear.
w Select “Sounder Menu” using the [UP] or [DOWN] key and press the [SET] key.
The Sounder Menu screen will appear.
e Select STC using the [UP] or [DOWN] key and press the [SET] key.
The selected item turns blue.
r Enter the desired immunity level from among 15 levels using the [UP] or [DOWN]
key and press the [SET] key.
The setting is now saved.
t When you finish setting the immunity level, press the [MENU] key to close the
Main Menu screen.
