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  1. #1
    Member
    Join Date
    May 2012
    Location
    Michigan
    Posts
    14

    Humminbird 999 ci HD SI W/RCI

    What is the difference between the Humminbird 999 ci HD SI and the 999 ci HD SI combo and how do you tell if you have the combo without powering unit up?

  2. Member
    Join Date
    May 2016
    Location
    Nebraska
    Posts
    89
    #2
    There is no difference.

  3. Member Wayne P.'s Avatar
    Join Date
    Jan 2010
    Location
    Charlottesville, VA
    Posts
    30,308
    #3
    All SI units are a combo of sonar and GPS

    The Helix units have GPS in the name rather than Combo
    Wayne Purdum
    Charlottesville, Va.
    Helix 12 CHIRP MEGA+ SI G3N/G4N, Helix 15 CHIRP MEGA SI+ GPS G4N
    SOLIX 12 SI/G3, Helix 8 CHIRP MEGA SI+ G4N, Ultrex 80/LINK, MEGA360,
    MEGA LIVE, LIVE TL

  4. Member
    Join Date
    May 2012
    Location
    Michigan
    Posts
    14
    #4
    Awesome! Thanks for the reply!