Humminbird 300TX manual Control Functions

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-