The Units of Measure Menu.
To set Units of Measure: Press ↓ to the desired units, then press ENT. After all the options are set as desired, press EXITEXIT to return to the page display.
Upper and Lower Limits
See the entry in this section for Depth Range - Upper and Lower Limits
Volume
This command adjusts the speaker volume, which controls the sound levels for keystrokes and alarms. If you want to turn off all sounds, set the volume to zero.
To adjust volume:
1.Press MENUMENU↓ to VOLUMEENT.
2.The Volume Control Bar appears. Press ↓ to decrease the volume; press ↑ to increase the volume. When it's set at the desired level, press EXIT.
Zoom & Zoom Bar
"Zooming" the display is used to enlarge small detail, fish signals and the bottom with its associated structure.
The 2X zoom doubles the size of all echoes on the screen. The 4X zoom quadruples the size of the echoes. You can also turn on a zoom bar on the far right side of the screen; this shows which echoes will be displayed on the screen when the Zoom commands are used.
For example, turning on the 2X zoom will show all echoes that are between the top and bottom of the 2X zoom bar. The 4X zoom will show only the echoes between the top and bottom of the 4X zoom bar.
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