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There are two kind of echosounders available for the NavNet3D system. DFF1 and DFF3. DFF1 has a transmission effect of 600W and 1 kW while the more powerfull DFF3 has an effect of 1,2 or 3 kW.
Both the DFF1 and DFF3 can be directly connected to your MDF or Black Blox via a simple ethernet cable.