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Operating the Zoom is quite simple, and only requires the pressing of a few buttons to select the
size and position of your Zoom window.
Begin from the factory default screen open (Flasher in center, Vertical Display on left, Vertical
Zoom on right). The area that is featured on the Zoom Display is indicated by the “Zoom
Indicator Bar”, a light blue bar on the right side of the Vertical Display. When you press the
ZOOM button, a “Zoom Depth” window will appear at the bottom of the screen. This is where
you set the uppermost limit of the Zoom Display by pressing the UP/DOWN buttons. When you
have the desired depth highlighted, pressing ZOOM again will establish that depth as the top of
your Zoom display. You will notice that the Zoom Indicator Bar will move up or down as you
make these adjustments. To set the size of what is shown in the Zoom Display, press MENU,
and then highlight “Zoom Window”. You can now select which size zoom window you want.
Going through this process several times before you go fishing is a great idea, as that will allow
you to easily and quickly adjust right away once on the water.
If you have only the Flasher Display, the Vertical Display, or the Scrolling Graph Display open,
and go into zoom mode, pressing the “ZOOM” will cause the vertical zoom window to appear,
and a “Zoom Depth” window will open at the bottom of the screen. You will still set the upper-
most limit of your zoom window here, but you won’t have the advantage of having the Zoom
Indicator Bar to show you exactly what area is being highlighted. With a little bit of experience,
you’ll find this to be quite easy to do. Just set the zoom depth for 5, 10, 20, or 40 feet above the
bottom, and then set the Zoom Window to the size that is appropriate.
For example, if you were fishing in 30 feet of water, and wanted to zoom in on the bottom 10
feet, press ZOOM, and then set the zoom depth for 20 feet (10 feet off bottom). Now press
MENU, highlight “Zoom Window”, and select 10 feet. The 20 to 30-foot portion of the water
column is now displayed on the Zoom display, and the entire water column is viewable on the
flasher window.
The MarCum Digital Sonar also features “Chart Zoom” which enables you to use a scrolling
graph in Zoom mode. Activate the Chart Zoom in the Display Options of the menu. You set the
zoom just as you would when using the other sonar options. When you press the ZOOM button
to make a change, the Vertical Zoom window will automatically open. After adjustments have
been made, you may turn the Vertical Zoom window off again in the Display Options of the
menu.
CONE ANGLE INFO
A feature unique to the Digital Sonar is the “Sonar Footprint” that displays the actual area being
covered by your transducer while you are fishing. This data is displayed below the cone angle
icon and represents the diameter of the base of the transducer cone. This will keep you
constantly updated how much area is being covered by your Digital Sonar and will help you
decide which transducer angle best suits the conditions. When the Digital Sonar is first turned
on, it will be transmitting utilizing the 20-degree setting. To switch from 20 degrees to 8 degrees,
simply press the CONE ANGLE button once, and the CONE ANGLE icon will change from 20
degree to 8 degree, and the Sonar Footprint will change with it.
Conditions where the narrow beam will benefit you are:
1 — Fishing in deep water (over 40’)
2 — Fishing along very steep drop-offs for bottom-hugging walleyes
3 — Fishing in big schools of fish, like suspended crappies
4 — Fishing in and around heavy weeds or standing timber
5 — When fishing in a crowd, the narrow beam will reduce interference.
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