Furuno SFD-1010 Operator's Manual page 114

3. FISH FINDER
There are two bottom discrimination displays as follows.
Gravel
Rock
Sand Mud
Rock
Sand
Graphic display
The most probable bottom material is indicated.
Notes
The bottom discrimination function is intended to provide an estimate of bottom

composition. Actual composition may be different from the discrimination result.
The transducers that support the bottom discrimination function are as follows:

When the bottom discrimination function is active, the high and low frequencies are

alternately transmitted even in the single frequency display mode. Also, the
transmission interval of this equipment becomes slower than conventional fish finders.
Use this function at the water depth of 5 to 100 m.

Use this function at the ship speed of 10 knots or less.

This bottom discrimination function uses the range from the boat's draft; therefore,

be sure to enter the ship's draft.
If transducers are not mounted straightly, the bottom material may not be analyzed

accurately.
How to activate the bottom discrimination function
Touch control:
1. Press the MENU/ESC key to open [MENU].
2. Tap [DISPLAY].
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Probability bar
Bottom discrimination
display
Gravel
Mud
The probability of bottom material is indicated
graphically.
Transducer (optional)
Rock Gravel
Sand Mud
Rock
Sand
Graph example
Mud probability (approx. 25%)
Sand probability (approx. 25%)
Rock probability (approx. 50%)
Probability display
Gravel
Mud