Raymarine C140w, C90w manual Fishfinder preset configuration, Sonar frequency

Menu Item	Description	Options
Depth Digit Position	Position of the digit that	•	Bottom
	indicates the depth.	•	Top
Target Depth ID	Controls whether the	•	On
	depth of identified	•	Off
	targets are displayed.
	The level of targets
	displayed is directly
	linked to the level of Fish
	Alarm sensitivity.
Depth Lines	Controls whether	•	On
	horizontal lines	•	Off
	indicating depth are
	displayed.
Color Palette	Various color palettes	•	Classic Blue
	are available to suit	•	Classic Black
	different conditions
	and your personal	•	Classic White
	preferences.	•	Sunburst
		•	Greyscale
		•	Inverted Greyscale
		•	Copper
		•	Night Vision
Scroll	Select AUTO to vary the	•	Manual
	scroll speed in relation	•	Auto
	to your boat’s speed or
	MANUAL to specify the
	Scroll Speed.

Menu Item	Description	Options
Manual Scroll Speed	If the Scroll menu item	10 to 100%
	is set to MANUAL,
	specify the percentage
	of the normal speed that
	screen should scroll at

Fishfinder preset configuration

Sonar frequency

The frequency of the sonar determines the width of the sonar beam and the depth to which the signals will penetrate. Each of the 4 preset operating modes has its own frequency settings. The frequency setting is indicated in the status bar.

There are 3 available frequency settings:

•50 kHz produces a wide sonar beam and penetrates the water well. It provides a lower resolution image that may not be as good at detecting small fish. Typically use this if you require a large coverage beneath your boat or if you are in deep water.

•200 kHz produces narrow beam of quicker shorter sonar waves. These produce a high resolution image but do not penetrate the water as well as the lower frequency. This frequency is most useful in shallower water (up to 1000 ft).

•Auto. When operating in automatic frequency your DSM automatically selects the appropriate frequency for your depth, 50 kHz in deep water and 200 kHz in shallower water.

Using the fishfinder 167