Raymarine DSM25 - Chapter 3: Using the Sounder Module

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Chapter 3: Using the Sounder Module
3.1 Introduction
The standard fishfinder image is an historical, scrolling bottom graph at an
automatically selected range and frequency. Various functions are provided to
improve the underwater view, select what is displayed and sound an alarm
including:
• Change the range (Range)
• Shift the selected viewing range (Range Shift)
• View a zoomed area (Zoom)
• Flatten the bottom image to help separate fish from the bottom (Bottom
Lock)
• Show a “real time” image of fish and bottom structure directly below the
transducer (A-Scope)
• Change the size of the depth digit
• Isolate bottom fish using White Line and Bottom Fill
• Pause the scrolling image
• Set the frequency
• Manually adjust the sensitivity, color gain and time varied gain settings
• Use waypoints to mark positions
• Use fishfinder alarms (fish, depth or water temperature)
D7935-1
ZOOM
BOTTOM
LOCK
A-SCOPE PRESENTATION
FISHFINDER
SETTINGS
81254.book Page 23 Monday, March 6, 2006 2:29 PM