Furuno FCV-627, Operator'S Manual

Page: 21 / 65

1. OPERATION
13
Note 1: You can show the fish info figure
alone (without fish symbol) by turning off
[Fish Symbols] on the [Display] menu.
Note 2: You can show the fish info in
small or large characters, with [Info Size]
on the [ACCU-FISH] menu.
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 600 W transducers and triducers that
support the bottom discrimination feature
are
520-5PSD, 520-5MSD, 525-5PWD,
525STID-MSD, 525STID-PWD.
• 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
• The bottom discrimination feature uses the
distance from the boat’s draft. Be sure to
enter the boat’s draft.
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 (on the [Transducer] menu).
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
㩷
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