Furuno GP-3500F User Manual

Page 177

Advertising
background image

11. VIDEO SOUNDER OPERATION

11-5

11.2.5

Bottom-lock display (50 kHz or 200 kHz)

The bottom-lock display provides a compressed normal picture on the right half
of the screen and a 3 or 6 meters (10 or 20 feet) wide layer in contact with the
bottom is expanded onto the left half of the screen. This mode is useful for
discriminating bottom fish from the bottom echo. You may select the bottom lock
range. Refer to paragraph 11.19.

AUTO C

0.0

5.6

°

C

10.0 kt

1'10"

m

Zoom marker

Normal display

Fish school

Fish
school

50k

0

20

40

60

80

BOTTOM-LOCK

DISPLAY

8

6

4

2

0

10

38.6

Bottom-lock display plus normal sounder display

11.2.6

Bottom discrimination display (50 kHz or 200 kHz)

The bottom discrimination display shows the normal display as the right half, the
left half of the display is split in half horizontally with the bottom zoom display on
the upper half and the bottom discrimination display on the lower half.
A bottom displayed with a short echo tail usually means it is a soft, sandy bottom.
A long echo tail means a hard bottom.

AUTO C

1'10"

m

Normal
display

50k

38.6

BOTTOM-ZOOM

DISPLAY

Long=Hard bottom
Short=Soft bottom

Bottom trail

BOTTOM

DISCRIMINATION

DISPLAY

2

0

20

40

10.0 kt

5.6

°

C

4

0.0

0

20

40

60

80

Bottom discrimination display

Advertising