Furuno GP-1850WF Automatic Sounder Operation, Manual Sounder Operation, Selecting the manual mode

2.5Automatic Sounder Operation

Automatic sounder operation is useful when you are preoccupied with other tasks and do not have time to adjust the display.

How the automatic sounder works

The automatic sounder function automatically selects the proper gain, range scale and clutter suppression level according to depth. It works as follows:

•Range changes automatically to display the bottom echo on the screen.

•The gain is automatically adjusted to display the bottom echo in reddish brown (default color arrangement).

•Clutter, which suppresses low level noise, is automatically adjusted.

Two types of automatic sounder modes

Two types of automatic sounder modes are available: CRUISING and FISHING. CRUISING is for tracking the bottom, and FISHING is for searching fish schools. CRUISING uses a higher clutter rejection setting than FISHING therefore it is not recommended for fish detection - weak fish echoes may be erased by the clutter suppression circuit.

How to enable automatic sounder operation

1.To show the mode/freq window: Normal sounder display: Press the MODE/FREQ soft key. Plotter/sounder display: Press the SNDR, MODE/FREQ soft keys in order.

2. VIDEO SOUNDER OPERATION

Dual-frequency display: Press the

MODE soft key.

MODE/FREQ

▲

AUTO CRUISING

AUTO FISHING

MANUAL

▼

Mode/frequency window

2.Press ▲ or ▼ to select AUTO CRUISING or AUTO FISHING.

3.Press the RETURN soft key to close the window, or wait 10 seconds and the window closes automatically.

2.6Manual Sounder Operation

Manual operation is useful for observing fish schools and bottom using a fixed gain setting.

The gain, clutter, range and range shifting functions used together give you the means to select the depth you can see on screen. The basic range can be thought of as providing a “window” into the water column and range shifting as moving the “window” to the desired depth.

Selecting the manual mode

1.Press the appropriate soft keys to show the MODE/FREQ window.

2.Select MANUAL.

3.Press the RETURN soft key.

2-5