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the intensity of the sonar return. While signal intensity is a good indicator of
relative fish size, different species of fish have different sonar characteristics, so
it is not always possible to distinguish fish size between varying species. The
signal intensity is "normalized" for depth so that a small fish close to the boat
does not appear as a large fish symbol.
ID+ adds an additional piece of information to help the user locate fish. On selected
fish symbols, the digital depth of the designated fish is drawn to help locate the fish
vertically. This is especially helpful in setting bait depths or for downrigger
operation.
CONTROL FUNCTIONS
The 425SX uses a simple six button keypad for all user input. Press any button
and an audible “chirp” confirms the control input. If a button has no function or
is inappropriate for the situation, an audible “error” is heard. The unit sounds
multiple chirps.
Power. The Power button powers the 425SX up for normal operation. When the
unit is on, POWER turns the unit off. POWER can also be used to go directly into
Simulator mode. To enter simulator, with the unit powered off,
press and hold POWER for several seconds until a continuous chirp
is heard.
Light. LIGHT controls the unit’s display backlight. With the unit
powered on, press LIGHT once to turn the backlight on “low.”
Press LIGHT a second time to turn the backlight on “medium,” a
third time to turn the backlight on “high”, and a fourth time to
turn the backlight off. The backlight is very effective for low-light
and nighttime operation. When the backlight is on, the 425SX will
consume more power than with the backlight off. This is
important when using the 425SX in a portable configuration
powered by a separate battery, or when powering the unit from a
trolling motor battery.
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USING THE 425SX
CONTROL FUNCTIONS