Question about Furuno Navnet 1964CBB/NT vx2 Radar C Map Nt

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I have a vx3 furuno and my sounder w/ 1kw transducer reads and marks the bottom great. once I get past 1300 ft the sounder will read the bottom the the depth number is not right. I fish in 1800 to 2000 ft but the sounder unit thinks it is in 1500ft I have check gains, units of measure 50mh and 200mh . I have used this machine for years with great proformance but this week the machine will not read acturately past 1500 ft. any ideas its sounds unreal but the machine will not read past 1500ft it thinks it is in 1500ft marks the bottom looks right but its is deeper. please help

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  • John Barry
    John Barry May 11, 2010

    this sounds suspicious, the transducer may have something growing on it or hanging from it. Is the picture scrolling when you experience this or is it frozen?

  • John Barry
    John Barry May 11, 2010

    do you really mark the bottom at 200 feet but it is still reading 1500 on the digital readout?

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check your gain setting try auto gain and try manually gaining back to see if it resolves, if yes, send unit in to furuno, if no, ducer is probably at fault.

Posted on Jan 16, 2010

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SOURCE: i have a furuno fcv 585 and have an airmar 1kw

no, the ducer should have the diplexer built in to it.

the matching box is for bare wire ducers.

Posted on Aug 04, 2010

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