Raymarine e7D, Installation And Operation Handbook, Page: 158 / 270

14.1 Fishfinder introduction
Warning: Sonar operation
• NEVER operate the sounder with the boat out of
the water.
• NEVER touch the transducer face when the sounder
is powered on.
• SWITCH OFF the sounder if divers are likely to be
within 7.6 m (25 ft) of the transducer.
Fishfinder overview
The fishfinder application provides a detailed view of the fish and
seabed under your vessel, enabling you to accurately distinguish
between different sizes of fish, bottom structure, and underwater
obstacles. The standard fishfinder image is a historical, scrolling
bottom graph with range and sonar frequency automatically selected
by the system.
The various functions and features of the fishfinder application
include:
• Preset modes for easy optimal operation.
• Display modes (Zoom, A-Scope or Bottom Lock).
• Adjustable range and zoom.
• Finding bottom feeding fish with the bottom lock display mode.
• Clutter and gain options to simplify the image.
• Pausing and adjusting the speed of the scrolling image.
• Using waypoints to mark a position.
• Determining depths and distances of targets.
• Fishfinder alarms (fish, depth or water temperature).
Fishfinder screen
The fishfinder displays a scrolling image of the seabed, updating
from the right as your vessel makes progress.
Example fishfinder screen
The fishfinder window includes the following aspects:
• The bottom together with any bottom structure such as reefs and
shipwrecks etc.
• Target images indicating fish.
• A status bar noting the frequency and gain settings.
• The bottom depth.
Status icon
The fishfinder status icon is located on the Status icon bar:
• Icon animated - fishfinder is operating.
• Icon static - the fishfinder transducer is connected but not
transmitting.
• Icon greyed-out - no fishfinder transducer is connected.
How the fishfinder works
The fishfinder application uses a Digital Sounder Module (DSM) and
a suitable sonar transducer. The DSM interprets signals from the
transducer and builds up a detailed underwater view.
The transducer is located on the bottom of the boat, it sends pulses
of sound waves into the water and measures the time it takes for the
sound wave to travel to the bottom and back. The returning echoes
are affected by bottom structure and by any other objects in their
path, for example reefs, wrecks, shoals or fish.
Colors are used on the display to indicate the strength of the returns.
You can use this information to determine the bottom structure,
the size of fish and other objects in the water, such as debris or
air bubbles
Note: Some transducers include additional sensors to measure
water temperature and/or speed.
Fishfinder context menu
The fishfinder application includes a context menu which provides
fishfinder information and menu items.
The fishfinder context menu can be accessed by:
• Selecting a location using the Joystick and pressing the Ok
button, or
• Selecting and holding on an area on screen — Hybridtouch
multifunction displays only.
The context menu provides the data for the position of the cursor:
• Range
• Depth
The context menu also provide the following menu items:
• Place Waypoint
• Place Marker
The menu items can be accessed:
• using the Rotary Control and Ok button, or
• selecting the menu item on screen — Hybridtouch multifunction
displays only.
158 e7 / e7D / e95 / e97 / e125 / e127 / c95 / c97 / c125 / c127