Eagle Electronics STRATA 128 - Manual (Page 22)

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After you select the desired range, press the
PWR key to clear the display. If you wait a few
seconds, it will automatically clear.
This unit has the following ranges:
10, 20, 40, 60, 120, 240, 480, and 900 feet.
and
5, 10, 20, 40, 60, 100, 200, and 300 meters.
ZOOM
The zoom feature enlarges all echoes on the
screen. If the unit is in the automatic mode, it
tracks the bottom signal, always keeping it
near the bottom of the screen. This lets you
see small detail, at the same time enlarging all
echoes that appear on the screen. The unit
doesn’t track the bottom in the manual mode,
and the adjustments are slightly different.
Zoom - Automatic Operation
To zoom the display, first press the MENU
key until the RANGE/ZOOM menu appears
as shown at right. Now press the down arrow
key. This switches the unit into the zoom
mode. A new menu immediately appears as
shown below.
This is the zoom size menu. Zoom size is the
distance between the upper limit and the
lower limit. The upper limit shows at the top
left corner of the screen. The lower limit is in
the bottom left corner. For example, if the
upper limit is 40 feet and the lower limit is 70
feet, the zoom window size is 30 feet. The
word “TRACK” appears in this menu when
you first activate the zoom as shown at right.