Zoom Soft Key - Raymarine L750 Operating Handbook

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If you are using one of the dual frequency settings, you can get
some useful information from the fish symbols. If the fish is spotted
by the narrow 200 kHz beam, the fish symbol will be black or filled-
in. If a fish is detected by the wide 50 kHz beam, the symbol will be
hollow.
"Split" screen display
The Split display presents two separate images at the same time -
one from each of the transducers. The upper half of the display
shows the image from the 200 kHz transducer, and the lower half
shows the image from the 50 kHz transducer. See Fig. 3-9.
Remember, you can use these settings to modify the Downlooker,
Bottom Lock, or A-Scope displays. For example, you could set up a split
screen display using the A-Scope feature.
To change the frequency setting, press the Soft Key for Frequency at the
bottom of the display, then press the correct Soft Key to make your
choice. (The Soft Key for "Dual" has two choices. Press the Soft Key
until the choice you want is highlighted.)

Zoom Soft Key

The Zoom feature gives you a way of enlarging or magnifying a part of
the display area. Figure 3-10 shows the standard Downlook display with
the Zoom feature turned on. The right side of the display shows the
same information as the Downlook page. The left side shows the
zoomed or magnified view. (The "zoomed" display is actually larger only
in the vertical direction.) In each part of the display, the new information
appears at the right edge of the display, and moves to the left.
Many of the items on the Zoom page are the same as those on the
Standard page. There are a few new items:
Zoom magnification
This indicates the amount of "zoom" or magnification. You can set
the amount of zoom manually, using one of the Soft Keys which
appear when you press the Zoom Soft Key. See Fig. 3-11. You
can choose an x2 view (double the normal display size), x4, x6 or
x8. You must also select the area or "window" of the water you
want to zoom. See the next item.
L750 Fishfinder: Installation and Operation Handbook