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Intuitive layout displays surface temperature and speed on top and probe temperature and speed at the bottom of the screen. Backwards compatible with Model 840.

  • Units of measure: Fahrenheit/Celsius; feet/meters; MPH/KPH/KNOTS
  • 3-level adjustable red back light
  • Magnum digit screen for maximum visibility
  • Requires 12-volt power
  • Made in U.S.A.
  • Mount footprint 2" x 2 1/2"
  • Maximum vertical height 7 1/2" 
  • Flush mount opening 3 1/2" wide X 6 1/8" tall   
Outside USA:
Duties & taxes due upon delivery


  • 5
    Fish Hawk

    Posted by Mike Gaynor on 31st Jul 2022

    Nice response from service request. I was surprised when my unit failed since I have friends with much older units. Overall I am happy with the product ( quite expensive) and the service response from Fish Hawk. I think it is a valuable tool on my boat fishing Lake Michigan.

  • 4

    Posted by richard case on 30th Jun 2022

    unit works well. Reliability is in question. Service and support from Tanya Bocock is excellent.

  • 5
    X4 LCD only

    Posted by Steve Heller on 6th Jul 2020

    My very old display finally gave out… This insulation was quick and easy plugged it in & a big improvement easy to read works great thank you!

  • 5

    Posted by jason on 6th Jun 2020

    Great product

  • 5
    X4 Is Impressive

    Posted by Tom on 30th Mar 2017

    I had the original Fish Hawk 840, which I wasn't impressed with. The battery life was very short (ran on 9V battery), and the signal was iffy below 50 feet in depth. I upgraded the probe last summer, and was impressed at the performance. The battery life improved (4 AA's) significantly as well as a much better signal. I added the new X4 display this spring, and it is well lit, and the displayed numbers are big and easy to read. Very happy with the new X4 display.