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OPERATIONAL INSTRUCTIONS FOR LCR 3004:
The Humminbird LCR 3004 will operate fully automatic or manual at the discretion of the
operator. At the heart of the LCR 3004 is a microcomputer which is making thousands of
decisions every second. With the LCR 3004's automatic features you will quickly and easily learn
the basics of operating your unit and after a couple of trips on the water you'll be operating the
LCR like an expert. It is suggested that you familiarize yourself with each of the features and
controls prior to operating your LCR 3004.
1. Power: (See Figure 12). To activate the unit, depress the Power "On/Off" switch. The LCR
3004 always comes on in the automatic mode. In the automatic mode, the unit will find the bottom
by varying the sensitivity and selecting the proper depth range for a satisfactory return. Also, the
display below the bottom is blacked out to make the display easier to read.
To turn the unit off, depress the Power "On/Off" switch again.
2. Light: Depress the light "On/Off" switch to activate the display light for night or low light
conditions. The light is turned off by again depressing the "On/Off" switch. When using the night
light you will notice that the viewing angle, or best viewing position is different than during daylight
operation. Tilt the unit back until you find the best angle for night viewing.
3. Depth: In the automatic mode, the properdepth range is found as soon as the unit is turned on.
As you move into deeper water and the bottom goes off the screen, the next deeper depth range
will automatically be activated. Also, as you move into shallower water the depth range will
automatically change to the next shallower scale. This change is made when the bottom reaches
the top 15 pixels, not when the next depth range is reached. For example, on the 120 ft. range,
the bottom depth must reach about 24 feet before the depth range will change to 60 feet.
You may also manually change the depth scale by pressing the depth set button. Each time this
button is depressed the range is decreased by one setting. For example, if you are on the 0-30 ft.
scale, pressing the depth set button once will change the scale to 0-15 ft. Pressing it again will
change the scale to 0-120 ft.
Note: Should you attempt to change a depth scale which is less than the actual bottom depth, the
computer will automatically change the depth scale back to the proper position. For example, if
you are in 40 feet of water and you change the depth scale to 30 feet, the computer will
automatically change back to the 60 foot scale.
Remember, in the manual mode (see paragraph 4 below) the automatic range change is not
active.
The depth range is always displayed at the bottom of the LCR display. The LCR 3004 has four
depth ranges, 0-15; 0-30,' 0-60; and 0-120: The graduated depth scales down the left and right
side of the display will identify the proper depth based upon the range you are on at the time. On
the 0-15' scale, each line represents a one foot increment. On the 0-30' scale a two foot
increment, on the 0-60' scale, a five foot increment and on the 0-120' scale, a ten foot increment.
4. Sensitivity: Automatic Mode - Each time the unit is turned on, the automatic feature is on. In the
automatic mode the sensitivity is adjusted automatically to give a good return and the correct
depth range is selected. The word Auto will appear in the upper right hand corner of the display
any time the unit is in the automatic mode. The sensitivity bar at the top of the screen will
increase ordecrease automatically indicating the amount of sensitivity being used. In
deeperwaterthis barwill increase indicating more sensitivity. In shallow waterthe sensitivity
needed to achieve a good return will be less. Also in the automatic mode, the unit will blackout
the display beneath the bottom line.