Raymarine L470 - Manual (Page 61)

55
Operating Instructions
the selected range, then Bottom Lock will not display the
bottom image.
Bottom Lock
Range
The range for the Bottom Lock image is set independently
from the master range setting for the FishFinder. This
“Bottom Lock Range” is measured up from the bottom,
rather than down from the surface. The Bottom Lock Range
may be adjusted using the Setup Menu when the Bottom
Lock feature is enabled. (See page 73). The current setting
for the Bottom Lock Range is shown in the upper right
corner of the Bottom Lock image. This number is the
maximum distance above the bottom the unit will display on
the Bottom Lock image. (If the Bottom Lock Range number
is larger than the actual depth of the water, the unit will not
show any target in water shallower than the transducer
itself.)
The Bottom Lock feature may be used with a split screen presentation or
in a full-screen presentation. You can make a selection from the Setup
menu. See page 74 for details.