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7 measuring depth, 8 suppressing interference, 9 suppressing low level noise – Furuno GP-1650WDF User Manual

Page 21

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2. VIDEO SOUNDER OPERATION


2-7

2.7 Measuring

Depth

The VRM functions to measure the depth to
fish schools, etc., and it is always displayed.

1. Press ▲ or ▼ to shift the VRM.
2. Read the depth just above the VRM.

SNDR
FUNC

SHIFT

GAIN

RANGE

SOUNDER

MODE/

FREQ

50k

GPS 3D

VRM

20

30

40

50

30

20

10

0

42.0

17.5

Depth to VRM

How to use the VRM

Note:

This function is not available on the
plotter/sounder display.

2.8 Suppressing

Interference

Interference from other acoustic equipment
operating nearby or other electronic
equipment on your boat may show itself on
the display as shown in the illustration at the
top of the next column.

To suppress interference, do the following:

1. Press the [MENU] key and the

SOUNDER SETUP OPTIONS soft key.

2. Select NOISE LIMITER and press the

EDIT soft key to show the noise limiter
window.

NOISE LIMITER

OFF
NL1
NL2
NL3

Noise limiter window

3. Press ▲ or ▼ to select degree of

suppression desired; OFF, NL1, NL2 or
NL3. The higher the number the greater
the degree of suppression.

4. Press the RETURN soft key and the

[SNDR] key to finish.

Interference from Electrical inteference
other sounder

Types of interference


Turn the noise limiter circuit off when no
interference exists, otherwise weak echoes
may be missed.

2.9 Suppressing

Low

Level

Noise

Light-blue dots may appear over most of
screen. This is mainly due to dirty water or
noise. This noise can be suppressed by
adjusting CLUTTER on the SOUNDER
SETUP OPTIONS menu.

When the sounder mode is Auto, the clutter
suppression setting is fixed at AUTO. To
suppress low level noise in manual sounder
operation do the following:

1. Press the [MENU] key and the

SOUNDER SETUP OPTIONS soft key.

2. Select CLUTTER and press the EDIT soft

key to show the clutter window.

CLUTTER

3

Clutter window

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