Raymarine 465 Instruction Manual page 65

than 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 72). 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 73 for details.
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Operating Instructions