The Humminbird 859ci HD Combo is currently the cheapest unit from the 800 series. That’s because it doesn’t have Side Imaging or Down Imaging, and it’s not 360 Imaging compatible. Other than these, it’s pretty much the same as the 899 unit, featuring a full color, 7-inch diagonal screen, 800H x 480V pixel resolution, and with backlight, providing crystal clear, high-definition images.
Just like the other units of the 800 series, the 859ci HD Combo has DualBeam Plus sonar, offering two possibilities to scan the water, for a 200kHz / 20° and 83kHz / 60°. This unit has a power output of 500 Watts (RMS) or 4,000 Watts (PTP), and has a depth capability of 1,500 ft. However, it can be upgraded with an optional deepwater transducer, which will increase the power of the unit to 1,000 Watts (RMS) and 8,000 (PTP), and it’s depth reliability to 3,000 ft. It has SwitchFire and it’s also compatible with QuadraBeam Sonar technology.
The navigational features of this unit include precision GPS and the built-in ContourXD cartography package, which covers over 3,000 U.S. lakes. It’s also compatible with Navionics Gold/HotMaps or Lakemaster, featuring a dual card reader. Its memory can hold up to 2,750 waypoints, 45 routes and 50 tracks (20,000 points each).
Although the Hummingbird fish finder 859ci HD Combo does not include NMEA2000, Radar2, iPilotLINK and PC Connect, these are all supported.