Furuno NAVNET 1724C Manual do Utilizador descarregar pdf (Página 134)

4. VIDEO SOUNDER OPERATION

4-5

Bottom discrimination display

The bottom discrimination mode displays the bottom echo to help you determine bottom

hardness. A bottom displayed with a short echo tail usually means it is a soft, sandy bottom.

A long echo tail means a hard bottom.

20.0

NORMAL DISPLAYBOTTOM

DISCRIMINATION

DISPLAY

100

Zoom marker

Long tail = Hard bottom

Short tail = Soft bottom

Bottom tail

Bottom discrimination display

A-scope display (display only)

The A-scope display, available in all modes, shows echoes at each transmission with

amplitudes and tone proportional to their intensities, on the right 1/10 of the screen. It is

useful for estimating fish species and bottom composition. To turn on the A-scope display,

press the DISPLAY MODE soft key, select display mode desired, then press the A-SCPE

soft key to show “ON” on its label. For modes other than SINGLE FREQ the screen must be

split horizontally to show the A-scope display.

SINGLE FREQ DISPLAY A-SCOPE

DISPLAY

100

Strong echo (bottom)

A-scope display

Weak echo (fish)

No response

A-scope display

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Furuno NAVNET 1724C Manual do Utilizador Página 134