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CONTROL FUNCTIONS
The Wide 128 uses a simple 5-button keypad for all user input. When any button is
pressed, an audible "chirp" confirms the control input. In the event that a particular
button has no function or is inappropriate for the situation, an audible "error", or multiple
chirps, will be heard.
POWER, powers the Wide 128 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. With the
unit powered off, press and hold POWER for several seconds until a continuous chirp is
heard.
When a sonar signal is reflected off the bottom back to the transducer, there is often
enough energy left in the signal to be reflected off the surface of the water back to the
bottom a second time. Second returns appear as a slightly weaker bottom
representation exactly twice the depth of the primary bottom return. The second return
is most likely to occur in shallow water and in areas of relatively hard bottom.
The Wide 128 uses advanced signal processing to further evaluate any sonar return between the surface
and the bottom. For instance, a small school of bait fish usually appears as a dense cluster of individual
dots. If the return meets certain additional criteria, a fish symbol will be assigned. There are three different
size fish symbols used to indicate 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.
LIGHT controls the unit's 3-position display backlight. With the unit powered on, pressing LIGHT once will
turn the backlight on "high". Pressing LIGHT a second time will turn the backlight on "low", and pressing a
third time will turn the backlight off. The backlight is very effective for low-light and nighttime operation.
When the backlight is on, the Wide 128 will consume more power than with the backlight off. This is
important when using the Wide 128 in a portable configuration powered by a separate battery, or when
powering the unit from a trolling motor battery.
NOTE: When powering the unit from a battery such as in portable applications, avoiding use of the
backlight prolongs battery life.
The three lower buttons, MENU, UP ARROW, and DOWN ARROW work together to control the Wide 128
menu-controlled user functions.
MENU brings a menu on-screen for adjustment. In normal operation, pressing MENU repeatedly will cycle
through all available menu headings. When the desired menu heading is displayed, the full menu appears
after a short pause. A menu remains on-screen for several seconds allowing user adjustment by means
of the ARROW keys. If no adjustment is made in the allotted time, the menu disappears. If you need the
menu to remain on-screen longer to study the adjustment options, press and hold MENU-the menu will
remain on-screen indefinitely. Once you release the menu button, the screen will time out.