Furuno 1934C-BB Description of sounder displays, Single-frequency display, Dual-frequency display

4. VIDEO SOUNDER OPERATION

4.1.2Description of sounder displays

Single-frequency display

Variable Range Marker (White)

	Minute marker		Time	Depth scale
Zero line			0'30"	0	SOUNDER
Icons (alarm,	S I M
					SINGLE
battery,
simulation)	°F
	50		50.0		A SHIFT
				50
Color bar
	40	Fish	Cross-hair			AUTO/
		echo			B
Temp.			cursor			D.BOX
				100
scale	30				C	FREQ
Water						LF / HF
temp.				150	D	DISPLY
graph
						MODE
Water	120				E	SPLIT
	LF			200		/
temp.
			Bottom echo
display	Tx frequency
	Depth

Indications on the single frequency display

Display mode

SOUNDER DUAL SOUNDER SINGLE SOUNDER M. ZOOM SOUNDER B. ZOOM SOUNDER B/L SOUNDER B/D

Soft keys

Note: The water temperature display requires an appropriate water temperature sensor. It can be turned on or off with TEMPERATURE GRAPH on the SOUNDER MENU.

Selecting transmission frequency

The single frequency display shows either the LF (low frequency) picture or HF (high frequency) picture. To select transmission frequency, press the C: FREQ LF/HF soft key. “LF” or “HF” is highlighted on its key label with each press of the key.

0.0

Dual-frequency display

The dual-frequency display provides both LF and HF pictures. This display is useful for comparing the same picture with two different sounding frequencies.

LF picture
The sounder uses ultrasonic pulses to	LF	HF
detect bottom conditions. The lower the		Dual-frequency display
frequency of the pulse, the wider the

detection area. Therefore, the low

frequency is useful for general detection and judging bottom condition.

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