Furuno FCV-588, Operator'S Manual

Page: 20 / 80

1. OPERATION
13
1.16 Bottom Discrimi-
nation Display
The bottom discrimination display analyzes
the bottom echo to categorize bottom hard-
ness in one of four types (rocks, gravel, sand,
mud) and shows the results in a colorful
graphic display. A transducer or triducer that
supports the bottom discrimination display is
required.
There are two bottom discrimination displays:
graphic and probability.
Graphic display : The most probable material
on the bottom (mud, sand, gravel, rock) is in-
dicated graphically.
Probability display : The most probable bot-
tom material is indicated in proportion.
About the bottom discrimination display
• The bottom discrimination display provides
an estimate of bottom composition. Actual
composition may be different.
• The transducers that support the bottom
discrimination feature are as follows:
• The high and low frequencies are alternate-
ly transmitted, regardless of current display
selection. The TX interval is slower when
this feature is active.
• Operating environment:
- Depth: 16 to 328 ft
- Speed: 10 knots or less
• This feature uses the range from the boat’s
draft; therefore, enter the ship’s draft. See
page 26.
• Be sure that the transducer is mounted
straight. Otherwise the bottom discrimina-
tion display may not function accurately.
How to activate the bottom discrimina-
tion display
Note 1: Auto range (AUTO_R) is automatical-
ly turned on when the bottom discrimination
display is activated.
Note 2: The bottom discrimination is inopera-
tive when the transducer type is selected to
600 W or 1 kW (FCV-588 only), on the [Trans-
ducer] menu.
1. Open the menu, select the [Display]
menu, select [Bottom Disc.], then press
the
ENTER key.
Bottom
discrimination
display column
Probability
bar
Hardness legend
Probability bar:
Degree of trust for bottom discrimination display
(Green, Normal; Yellow, Caution;
Background color, Abnormal)
Rock Gravel Sand Mud
Hardness
legend
Bottom
discrimination
display
column
Probability
bar
Mud
Sand
Gravel
Rock
Graph example
Mud probability
(Approx. 25%)
Sand probability
(Approx. 25%)
Rock probability
(Approx. 50%)
Graph example
Transducer (option)
600 W 520-5PSD, 520-5MSD, 520-PLD,
525-5PWD, 525T-PWD, 525T-BSD,
525T-LTD/12, 525T-LTD/20,
525STID-MSD, 525STID-PWD,
SS60-SLTD/12, SS60-SLTD/20
1 kW 50/200-1T, 526TID-HDD