Furuno Ls4100 manual Single frequency display, Dual frequency display, Marker-zoom display, 50 kHz

Single frequency display

50 kHz

The sounder uses ultrasonic signals to detect bottom conditions. The lower the frequency of the signal, the wider the detection area. Therefore, the 50 kHz frequency is useful for general detection and judging bottom condition.

200 kHz

The higher the frequency of the ultrasonic signal the better the resolution. For this reason the 200 kHz frequency is ideal for detailed observation of fish schools.

50 kHz

200 kHz

Frequency and coverage area

Picture Advance Speed

Mode

(AUTO or MANUAL)

Frequency

Dual frequency display

The 50 kHz picture appears on the left; the 200 kHz picture on the right. This display is useful for comparing the same picture with two different transmitting frequencies.

50/200		1/1
	0.0	0

50 kHz	200 kHz
picture	picture
20	20
40	40
60	60
49.6	80
80

Dual frequency display

Marker-zoom display

This mode expands chosen area of the normal picture to full vertical size of the screen on the left-half window. You may specify the portion to expand by operating the VRM (Variable Range Marker), which you can shift with ▲ or ▼. The area between the VRM and zoom range marker is expanded.

	Single frequency display
	50k	1/1
Zoomed17	0.0	0

Minute

Marker (Shows time. Each bar

is 30 sec.)

			50k		1/1
			0.0	0
40.7° F		Nav Display
16.2kt
	Level Bar
Fish		Transmission 20
School		Line

Range Scale

40

Bottom

60

	fish	18		Fish			Variable range
	school
				school		10	marker
		19
					17.0		This section
			20
		20					is zoomed
25.0		21		30			Zoom marker
		22
			40
	Marker-zoom display

Marker-zoom display

Depth 46.6

Typical 50 kHz display

3