Eagle Electronics Cuda 128 Portable - Manual (Page 39)

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temperature display can be turned on and off. See the later entry on
Temperature Size for off and on instructions
DEPTH RANGE ZOOM (automatic and manual)
When turned on, the unit automatically adjusts the depth
range according to water conditions. When in auto range
mode, it always keeps the bottom displayed in the lower
portion of the screen. You can over-ride the automatic depth
range control and manually select a depth range.
To do this, press MENU until the R ANGE Z OOM
menu appears. Press the
DOWN ARROW to select M
ANUAL
, then press MENU UP to display the
R ANGE S IZE
menu. Use the arrow keys to select a desired depth range.
When you're finished, press PWR to clear the menu from the display.
This unit has the following depth ranges: 10, 20, 40, 80, 160, 320 and
640 feet.
Range Size menu with manual depth range set to 40 feet. This in effect
"zooms" or enlarges the display to show the water column from 0 to 40
feet deep. In this figure, the boat is in 57.5 feet of water, but only the
top 40 feet of the water column is shown on the screen.