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8
rSOUNDER MODEq MANUAL SETTING OF SENSITIVITY
(8) Manual Setting of
Sensitivity
To set the sensitivity to ultrasonic reflected from the sea bottom, proceed as
follows.
q Press the [GAIN] key.
The level bar will appear on the screen and is indicating the current level.
* The level bar is inoperative when the system is in auto sensitivity mode or auto
operation mode.
w Using the [UP] or [DOWN] key, set the sensitivity level so that the portion close
to the sea bottom is displayed in red (color shown at the top of the color pattern)
and noises (blue) are not found in the water.
Each time you press the [UP] or [DOWN] key, the level bar changes in height in
increments of one step.
ePress the [GAIN] or [SET] key to save the setting.
The sensitivity setting is critical to ensure optimal fishfinder performance.
Be sure to set the sensitivity properly when using the system in manual
mode.
The depth range is an underwater range in depth that contained in the screen
image.
Available units of the depth range include m (metes), FT (feet) and FM (fathoms)
(☞ P. 63).
To set the depth range manually, proceed as follows.
q Press the [RANGE] key.
“RANGE” (“SHIFT” or “AUTO”) will be indicated in the depth field on the screen.
* If auto operation is active, it is canceled.
w Select “RANGE” using the [LEFT] or [RIGHT] key.
e Select the desired depth range using the [UP] or [DOWN] key.
Each time you press the [UP] or [DOWN] key, the depth range changes in incre-
ments of one step.
* On the Depth Range Selection screen (☞ P. 67), you can preset up to 31 depth
ranges suited to the sea bottom.
r Press the [RANGE] or [SET] key to save the setting.
(9) Manual Setting of Depth
Range
