Fig. 3-13 Bottom Lock Soft Keys - Raymarine L750 Operating Handbook

48
Range
When the Bottom Lock feature is turned on, the range is measured
up from the bottom, rather than down from the surface. The
number at the top of the display area shows the maximum distance
above the bottom the unit is prepared to monitor. The range setting
for the Bottom Lock feature can be changed using one of the Soft
Keys which appears when you press the Bottom Lock Soft Key.
See the next section.
You can use the Bottom Lock feature to modify the Downlook and
Window displays.
When you press the Bottom Lock Soft Key, three new Soft Keys appear
at the bottom of the display:
Bottom Lock On/Off
Use this Soft Key to turn the Bottom Lock feature on or off. When
you do this, the unit will say "Initializing Bottom Lock" for a moment.
Bottom Lock Full/Split
Once the Bottom Lock feature is turned on, the Bottom Lock image
can share the display as shown in Fig. 3-12. The Bottom Lock
image can also occupy all of the display area.
Bottom Lock Range
When the Bottom Lock feature is turned on, the unit uses a special
range setting. Press the Soft Key for Bottom Lock Range once to
highlight the range setting. Next, use the up- and down- controls on
the Trackpad to set the Bottom Lock Range. (Do not use the
Range button for this.)

Fig. 3-13 Bottom Lock Soft Keys

L750 Fishfinder: Installation and Operation Handbook