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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 operations.
The specific fish symbol indicates the type of sonar beam
the fish is detected in. This gives you a reliable indicator of
side to side location relative to boat movement. Fish
symbols which are hollow are detected in the outside two
beams. Hollow fish symbols facing to the left are detected
in the left beam, and thus the fish is to the left side of the
boat. Solid fish symbols represent fish in the single center beam, and these fish are
directly under the boat.
Control Functions
The 300 TX uses a simple, five-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, and audible “error” is heard. The unit sounds multiple
chirps.
Power. The Power button powers the 300 TX 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 ”high.” Press LIGHT a
second time to turn the backlight on “Low,” and a third time turns the
backlight off. The backlight is very effective for low-light and nighttime operation. When
the backlight is on, the 300TX will consume more power than the backlight off. This is
important when using the 300TX in a portable configuration powered by a separate
battery, or when powering the unit from a trolling motor battery.
When powering the unit from a battery such as in portable applications, you can prolong
the batter life by using the backlight at a minimum.
The three lower buttons, MENU, UP ARROW, and DOWN ARROW work together to
control the 300TX menu-controlled user functions.
Menu. MENU displays a menu on-screen for adjustment. In normal operation,
pressing MENU repeatedly cycles through all available menu headings. When a menu
heading displays, the full menu appears after a short pause. A menu remains in-screen
for several seconds, and can be adjusted by using the ARROW keys. If no adjustment
is made in the allotted time, the menu disappears. MENU—the menu will remain on-