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FOREWORD
A Word to the Owner of the DFF3
Congratulations on your choice of the FURUNO DFF3 Network Sounder. We are confident you
will see why the FURUNO name has become synonymous with quality and reliability.
For 60 years FURUNO Electric Company has enjoyed an enviable reputation for quality marine
electronics equipment. This dedication to excellence is furthered by our extensive global network
of agents and dealers.
This equipment is designed and constructed to meet the rigorous demands of the marine environ-
ment. However, no machine can perform its intended function unless operated and maintained
properly. Please carefully read and follow the recommended procedures for operation and main-
tenance.
Thank you for considering and purchasing FURUNO.
Features
The DFF3 network sounder is a dual frequency echo sounder designed for use with the FURUNO
NavNet/NavNet vx2/NavNet 3D series. The DFF3 feeds data about underwater conditions via a
LAN.
A few of the features are
• FURUNO Free Synthesizer (FFS) transceiver design allows use of user-selectable operating
frequencies (28 - 200 kHz).
• Automatic operation selects correct range and gain to show fish echoes and bottom in both
shallow and deep waters.
• Improved discrimination of near-surface fish by eliminating the transmission line.
• Heaving compensation* stabilizes the picture against ship’s pitching and rolling.
* Requires NavNet 3D display device and Satellite Compass SC-30, heading data fed in NMEA
2000
®
format.
• ACCU-FISH
®
feature estimates length and depth of individual fish.
(Transducer 50/200-1T only for use with NavNet 3D.)
• 1/2/3 kW output
Note: The terms “NavNet” and “Navnet 3D” refer to the models listed below.
Navnet/NavNet vx2 NavNet 3D
Model 17x2 Series, Model 17x2C Series,
Model 17x4 Series, Model 17x4C Series,
GD-1720, GD-1720C,
Model 18x3C(-BB) Series, Model 18x4C(-BB) Series,
Model 19x3C(-BB) Series, Model 19x4C(-BB) Series,
GD-1900C(-BB), GD-1920C(-BB)
MFDBB, MFD8, MFD12