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• Sonar Features command: launches the Sonar Features menu which
controls many functions and options, including screen color mode, auto
depth and sensitivity, surface clarity, noise rejection, Fish I.D. sym-
bols, the zoom bar and zone bar.
• Ping Speed command: sets the rate at which sonar pings are made.
Pages
The M56 has four major Sonar display options. They are the Full Sonar
Chart, Split Zoom Sonar Chart, Digital Data and Flasher.
You access the various display modes by pressing the
PAGES key, then
pressing → to
SONAR|↑ or ↓ to desired page|ENT.
The Full Sonar Chart is the main Sonar display option. This is a "cross-
section" view of the water column beneath the boat. The chart moves
across the screen, displaying sonar signal echoes that represent fish,
structure and the bottom.
Sonar Page, showing full sonar chart mode.
Surface clutter
Structure
Bottom signal
Fish arches
around
school of
bait fish
In FasTrack, fish
arches show as
horizontal bars.
Depth scale
Digital data
overlay
(depth &
temperature)
Surface signal
Zoom bar
FasTrack
bar graph