21 FOOT UPPER LIMIT
seconds and the menu will scroll off the screen’s left side. Pressing the ON/ CLR key also clears it.
To change the lower limit, again make certain the unit is in the manual mode. Press the MENU key until the "LOWER LIMIT" menu appears. Now press the down arrow key to increase the lower limit or the up arrow key to increase it. When you have the limit set, wait a few seconds and the menu will scroll off the screen’s left side. Pressing the ON/CLR key also clears it.
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 differ- ent.
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 at the top of the next page.
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