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Humminbird 859ci HD DI Review

Humminbird 859ci HD DI has an average rating of 4 out of 5 based on 6 user reviews.



When the goal is to catch as many fish as possible, the right equipment is crucial. Rods, reels, bait and boat can take a fisherman far, but to truly catapult to the next level it’s important to know where the fish are in relation to one’s location. To make sure they know where the fish are biting, more anglers are turning to the Humminbird 859ci HD DI.

Using a 7″ LED backlight display, this model offers one of the biggest and brightest screens available. Offering a high-resolution 480 x 800 picture, the fish and the structure below the surface are viewed in great detail. With 4,000 watts of PTP and 500 watts of RMS output, the 859ci HD DI has depth capacity of 600 feet in broadband mode and 250 feet in down imaging mode. The DualBeam PLUS feature provides a 20 degree precision beam for finding fish hiding in bottom clutter and a 60 degree wide view beam for an expanded. The beams can be viewed side-by-side, separately or blended together to create a complete picture of what’s below.

The Down Imaging technology displays a straight down view. Angler will practically see a photograph of exactly what is underneath their boat. Any type of structure such as rocks, bridge pilings, brush, or timber will be displayed in amazing detail. The view from the Down Imaging/2D sonar provides anglers with a complete understanding of exactly what is going on beneath their boat. The 2D sonar allows anglers to locate and target fish while the Down Imaging allows the quick identification of structure. The combination of the two takes the guesswork out of finding fish with sonar.

Additional features include Ethernet networking that requires adapter cables or a switch similar to the older 700-series models. There are also 3 preset buttons that are programmable for added convenience. The GPS has a 10 Hz refresh rate. The 859 is also equipped with dual card slots for saving waypoints and maps. Humminbird 859ci HD DI is easily expandable and upgradable in numerous areas and it makes any fishing experience easier and more enjoyable for beginners or experienced outdoorsmen. You can get a great deal on Humminbird 859ci HD DI here.

 Lowrance Elite-7 HDIGarmin echoMap 70dvHumminbird 859ci HD DI
Screen Size7 in7 in7 in
Screen Resolution480 x 800 pixels480 x 800 pixels480 x 800 pixels
Display Type16-bit color, Full VGA SolarMax PllusTFTMulti-touch touchscreen WVGA display16:9 Color TFT display
Imaging2D and Down Imaging2D and Down Imaging2D and Down Imaging
Transducer TypeTransom Mount/Trolling MotorTransom Mount/Trolling MotorTransom Mount/Trolling Motor
Transmit PowerMax 250W RMS
30,000W Peak to Peak analog equivalent
500 W (RMS)
4,000 W (peak to peak)
500W RMS
4000W Peak-To-Peak
Sonar Frequency50/200 or 83/200 kHz 2D
455/800 kHz Down Imaging
77/200 kHz

50/200 kHz with an optional dual frequency tranducer
200/455 kHz 2D
455/800 kHz Down Imaging
Maximum Depth1000 or 2500 ft 2D
300 ft Down Imaging
2,300 ft at 77 kHz freshwater
1,100 ft at 77 kHz, saltwater
600 ft 2D
250 ft Down Imaging
GPS Antenna TypeInternal, high-sensitivity GPS+WAASInternalInternal
Waypoint Storage300050002500
Plot TrailsUp to 100 trails - up to 10,000 points / trail50,000 points; 50 saved tracks50 w/20,000 points each
Preloaded MapsExpanded U.S. BaseMap or Insight USALakeVu HD or BlueChart g2 Vision coastal mapsHumminbird ContourXD

User Reviews

Posted by Tarheel10

  • 5/5

I’m very satisfied with this unit and the Humminbird customer service. When I first installed the unit and went to the water, the output was very erratic. I called the customer service while I was on the lake. They went through different settings with me for about half hour, in the end I had the unit working perfectly. Now I catch fish in areas no one else would fish.

Posted by Josh Keller

  • 5/5

This is my first down imaging unit. DI is great, you can clearly see the detail not visible in the sonar mode. I like the big display. I didn’t like the GPS that much until I bought the latest Lakemaster maps, the preloaded ones are not very good.

Posted by Jack S

  • 5/5

This unit works perfectly for me, I get accurate depth readings even at very high speeds. The image quality is superb, I see everything that’s under the water. There are many different options and configurations, I’ve been playing with it for weeks now and I’m still finding new options for different situations. This unit is big and heavy, make sure you have enough room to install it before you buy it.

Posted by Creek Ranger

  • 5/5

I purchased this unit because I wanted a fishfinder with a bigger screen and compatible with Lakemaster maps and i-pilot link. The GPS is accurate even when compared with external GPS units. I like that I can switch between down imaging and sonar, makes it easy to interpret the images.

Posted by Badger

  • 3/5

The unit works great but the preloaded maps are a joke. It doesn’t even have the maps for Delavan Lake in Wisconsin which is one of the largest lakes in the state.

Posted by Superhawk

  • 1/5

I have a hummingbird 859 ci HD Di and I have only had for 3 weeks. Today I went fishing and I began to make adjustments to it. All of a sudden the unit began to turn its self off & on. It kept doing it over & over but it never really turned its self off. So I unplugged the power to it thinking it would reset its self but it didn’t .

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