Raymarine e7 User Reference page 191

• 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:
Using the fishfinder
• 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.
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