Vexilar FL-8 - Manual (Page 10)

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setting of zero will display a minimum amount of signal while a gain
setting of ten will show the maximum amount. Different conditions
will require different gain settings. Deeper water will require higher
gain than shallow water. A weedy bottom will demand a lower gain
setting than a clean bottom. Keep the gain level low. Too much gain
can "wash out" the targets that you want to see. Generally, it is a good
idea to set the gain at an appropriate level and leave it there. Only
change the gain level if the water depth or conditions change.
ALARM CALIBRATION CONTROL
The knob located in the middle of the control panel is the alarm
calibration control. If you pull the knob out and turn it slightly clock-
wise you will see a red line appear. As you rotate the knob further
clockwise the red line will follow. This is the calibration point of the
alarm. If you set the calibration point to 20 feet, than anything that
appears red or orange between 3' (the minimum) and 20' will sound
the alarm. Green targets will not sound the alarm at all. Once you
have calibrated the alarm you can push the knob back in to remove
the red calibration line. The alarm will still function until you turn the
knob fully counter-clockwise. This alarm can be used for fish or bot-
tom.
TYPICAL INDICATIONS
The three color display on the FL-8 can give you a lot of informa-
tion if you know how to read it. A color represents the strength of a
signal. A red color indicates a strong signal, an orange color indicat-
ed a medium strength signal, and green represents a weak signal. The
colors will combine to indicate objects, such as bottom echoes, struc-
ture, fish, and plankton. The way in which they combine and the
speed in which they do so tells you what is what. The following
examples illustrate some of the different conditions that you may
encounter and what the display on the FL-8 may look like.