Furuno Ls4100 - Manual (Page 26)

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SPEED CALIB.:
If the speed
sensor-generated speed indication is
wrong, you can correct it here, when
“Own” is selected as speed source. For
example, if the speed indication is 10%
lower than actual speed, enter +10. The
setting range is –50% to +50%.
Page 3
BASIC RANGE 1 - BASIC RANGE 8:
Set range of each of the eight basic
ranges. (Selectable range: 7 to 1500 ft)
Note 1:
All default basic ranges are
restored whenever the depth unit is
changed. Therefore, change the depth
unit before changing the basic ranges.
Note 2: A range may not be lower than
the range preceding it. For example, if
basic range 3 is 60 feet, basic range 4
must be greater than 60 feet.
ZOOM RANGE:
Choose the range to
zoom in the marker-zoom and
bottom-zoom modes. You may choose a
range between 7 and 150 feet (2 and 50
meters).
B/L RANGE:
The expansion width for
the bottom-lock display can be chosen
from 10 to 30 feet (3 and 10 meters).
ZOOM MARKER:
The zoom marker
appears in the normal, bottom marker
and bottom zoom displays and marks
the area which is expanded in the
bottom marker and bottom zoom
pictures. You can turn the marker on or
off as desired.