Lowrance electronic M68C IceMachine - Manual (Page 79)

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To adjust sensitivity:
1. Start with your IceMachine showing the Ice Flasher page, in the de-
fault IceView color mode.
2. Drop your lure five to 10 feet directly below the transducer. You
should be able to follow the fall of the bait on the flasher screen.
2. Use the arrow keys to turn the sensitivity up or down until the lure
is barely visible as a black or blue signal band on the screen.
3. Now fish at the desired depth. When a fish approaches the bait, its
signal will stand out from the lure because it will be a moving signal
that is wider and a brighter color than your lure.
ColorLine

ColorLine is described in detail in Sec. 4. ColorLine changes will be re-
flected in the Echo Strength Color Scale. This scale considers both sen-
sitivity and ColorLine and then shows you the relationship of signal
strength to signal color. To adjust the ColorLine level:
1. From the Ice Flasher Page, press MENU |
↓ to
C
OLOR
L
INE
| ENT .
2. The ColorLine Control Bar appears. Press
↓ to decrease ColorLine;
press
↑ to increase ColorLine.
3. When it's set at the desired level, press EXIT .
ColorLine distinguishes between weak and strong sonar signals by
"painting" them with different colors. You can adjust ColorLine to suit
your personal viewing tastes. The left figure shows the default Color-
Line setting. The center figure shows a lower ColorLine setting and at
right, a higher setting. These black and white illustrations don't show
it, but the far left band on the Echo Strength scale is black, followed by
blue, green, yellow and at the far right, red.