The Humminbird 788ci is our first product review from this well-known marine electronics company. This one is a chartplotter fishfinder combo featuring a high-resolution 5-inch display screen, internal 50-channel GPS receiver, and a built-in 500-watt sounder.
All the other units in the 700-series lineup feature a 5-inch display screen. The sonar-only 718 and 728 use grayscale screens with the latter model having increased resolution. An optional GPS sensor turns either of this pair of fishfinders into chartplotter combo units.
Next up is the 788c, this sonar-only unit features a high-resolution color screen and will also interface with an optional external GPS sensor to make it a combo chartplotter fishfinder. Humminbird packages the 788c Combo with an external GPS sensor and markets it as a chartplotter fishfinder unit.

Humminbird 788ci
Our internal GPS equipped 788ci is next in line. At the pinnacle of the 700-series group is the 798c SI, this one uses the same high-resolution screen as the 788, an external GPS sensor, and has side scanning sonar capability.
For my review I mounted the display unit using accompanying bracket. This bracket is designed to be quick-release so you can remove the display for safe storage off the boat with the push of a single button. It will also rotate and tilt to optimize the viewing angle. Flush mounting this display unit in a panel requires the purchase of an optional kit.
Basics
The Humminbird 788ci package ships with the display unit, a protective front panel cover, two-directional mounting bracket, power cable, operations manual, quick reference guide, installation instructions, and a dual frequency transom mount transducer.
The back panel of the display unit has four connectors, one for the transducer, another for the power cable, a third for an accessory bus designed to interface with an optional weather receiver or Smartcast sensor, the fourth connector will allow you to update the 788ci software using a PC. Interfacing the 788ci with an NMEA 0183 device requires the purchase of an optional cable.
The display has a front panel footprint that measures approximately 6.8-inches wide and 5.4-inches high. Overall depth is 3.8-inches. The two SD cards slots on the front panel are





