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Adding a second depth finder

Discussion in 'Technical Discussion' started by C team, Jan 5, 2012.

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  1. C team, Jan 5, 2012
    #1
    C team

    C team Senior Member

    Joined:
    Nov 1, 2011
    Messages:
    249
    Location:
    Kent Island
    I currently have a fish finder/depth sounder on my boat but would like to add a back up depth finder. I am looking for a stand alone instrument or gauge just for the depth. Any suggestions on units would be greatly appreciated.

    Craig
  2. thebighawk, Jan 5, 2012
    #2
    thebighawk

    thebighawk New Member

    Joined:
    Apr 14, 2005
    Messages:
    59
    Location:
    FORT LAUDERDALE
    depth sounder

    If your fishfinder has dual frequency transducer 50/200khz, than any display that will take a NMEA input and use a transducer of 235KHZ, most common, or 177khz will work fine. seperate as much as you can for good measure
  3. C team, Jan 6, 2012
    #3
    C team

    C team Senior Member

    Joined:
    Nov 1, 2011
    Messages:
    249
    Location:
    Kent Island
    Not really sure what frequency my current unit operates on but I will dig into the owners manual to find out more. Thanks for the tip!
  4. d_meister, Jan 6, 2012
    #4
    d_meister

    d_meister Senior Member

    Joined:
    Mar 4, 2010
    Messages:
    481
    Location:
    La Conner, WA.
    Most dual frequency fishfinders are 50/200. We added a Garmin GMI-10 display with a NMEA 2000 transducer that sounds at 180khz. We wanted true redundancy and found that if the GMI-10 was networked to the primary Garmin NMEA 2000 network, it would use the network depth. As a standalone device, the big drawback to the GMI-10 is that there is no provision for keel offset.