Lowrance M56 S/Map Installation And Operation Instructions Manual page 40

time. You run a command by using ↑ or ↓ to highlight the command
and then pressing . To clear the menu screen and return to the
ENT
Page display, press .
EXIT
Sonar Page Menu. Most of these functions are discussed in
Sec. 4, Advanced Sonar Operation.
Sonar Menu Commands
The Sonar Menu contains commands for the major sonar features and
options. Most of them are only described in detail in Sec. 4, but Sensitiv-
ity and Auto Sensitivity are important basic functions that are discussed
both here and in the Advanced Sonar section. The other Sonar Menu
commands include:

• Grayline
command: separates fish and structure near the bottom
from the actual bottom, and defines bottom composition/hardness.
• Depth Range command: manually sets the depth range shown on
the sonar chart.
• Auto Depth Range command: automatically sets the depth range
shown on the sonar chart to always keep the bottom in view.
• Upper and Lower Limits command: sets the upper and lower depth
limits of the sonar chart. Lets you zoom in on a specific portion of the
water column.
• Stop Chart command: stops the sonar chart from scrolling. Used
when you want to "freeze" the image for closer study.
• Chart Speed command: sets the scrolling speed of the sonar chart.
• Depth Cursor command: displays a cursor line on the sonar chart
which allows you to accurately measure the depth of a sonar target.
• Overlay Data command: chooses what types of information (such as
water temperature) to show overlaid on the sonar chart screen.
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