Soft Keys; Bottom Lock - Raymarine L750 Operating Handbook

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Trackpad
The Trackpad is used when you are setting up the unit. We will explain
the details in Chapter 4.
For example, when you are looking at the System Setup menu, you use
the up-and down- controls on the Trackpad to move to the item you want
to change. Next, you use the left- and right- controls to select the option
you want.
When you are using the manual Zoom feature, you can use the
Trackpad to move the Zoom area up or down.

Soft Keys

Depending on the display you are looking at, the unit will present
different options or "Soft Keys" at the bottom of the display area. By
using the Soft Keys, you can call up different displays or change the set-
up of the unit. To select one of the Soft Keys, press the button below the
image on the display. Sometimes you must press the same Soft Key a
second time to make a choice or select an option. (These are called Soft
Keys because the functions change from one display to the next, and
are controlled by the software running inside the Fishfinder.)
The display shown in Fig. 3-1 shows four Soft Keys. These are
explained in the following sections.
Frequency
The transducer can use two frequencies - 50 kHz for wide coverage, or
200 kHz for a detailed view. You can also set the unit to use both
frequencies at the same time ("dual frequency"). (For more on this, see
"Choosing the Frequency.")
Zoom
The Soft Key for the Zoom feature appears on the main Downlooker
display. The Zoom feature allows you to select an enlarged or magnified
view of a section of the display.

Bottom Lock

The Soft Key for the Bottom Lock feature appears on the main
Downlooker display. The standard Downlooker display is a "top-down"
view, as if it was seen from the surface of the water. The Bottom Lock
display shows a "bottom-up" view. The bottom is used as the reference,
L750 Fishfinder: Installation and Operation Handbook