Humminbird 999ci HD SI Combo Review 2018

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The 999ci HD SI Combo is another fantastic fish finder from Humminbird and makes for a serious investment for the serious fisherman. Right out of the box it comes with a fantastic array of features including the GPS system and multiple ways of getting your readings. If you’re aspiring to be able to compete with the best you might want to take a closer look at this one.

Humminbird 999ci HD SI Combo


The 8” display on the 999ci HD SI is an immediate draw, making for a large viewing area. It has a resolution of 800×480 and comes in full color. The finder itself can also make use of a split screen view so you’ll be able to get more information at once. The large screen does a bit of size to the unit, but if you have the room aboard your boat it adds a whole new level of easy function.

Display Rating: 9/10

Finder System

This one comes straight out of the box with a bunch of features that are sure to please just about anyone. It comes with the standard readings as well as capabilities for Side Image and Down Image. It comes standard with 500W of power, but if you choose to make the upgrade with a deep sea transducer that doubles and you’ll find yourself able to read down to depths of 3000 feet with amazing clarity.

The transducer produces a number of different frequencies especially suited for all the different types of imaging. The normal dual frequency cone of viewing comes in at 83/200 kHz while the Side Image comes in at 455 kHz for a complete 180° view. The Down Image function operates at 50/800 kHz as well. With the wide variety of imaging types and the ability to split the screen, you’ll be able to easily find all the information you’ll need.

Finder Rating: 9/10

Additional Functions

The Humminbird 999ci HD SI also comes with an advanced GPS system built right into the unit. It comes loaded with Contour XD Maps, and has all the waypoint functionality some fishermen have come to find almost essential.

It also has an Ethernet connection and dual-card readers so you’ll be able to take your findings on the go with ease. The software can be easily changed if the user prefers a different mapping program as well, and almost every common mapping program is supported.

It has i-Pilot capabilities, so you can attach it to certain motors and control them directly from your finding unit.

Extras Rating: 9/10

Ease of Use

Like most Humminbird fish finders, this one has an easy to use and intuitive menu system that renders almost anyone capable of using the unit like a pro within a few minutes of picking it up. Once you have a decent grasp of the menu this system is ready to be an essential aid in your journey. The only problem here is that it may be a bit big for those with smaller boats where space is at a premium.

Ease of Use Rating: 8/10

Overall Rating

The Humminbird 999ci HD SI makes for a solid addition to the boat of almost any angler. Those who opt for the deep sea transducer will find it quickly becomes an essential part of their fishing routine even in the open ocean. It comes in with a great display, a lot of useful features, and a completely solid set up for the findings. If you’re willing to make the investment, this one will pay off big time.

Overall Rating: 9/10


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Hi! I’m Steven!

I am an avid life long fisherman, having caught over 25,000 fish over the years. My life-long passion for fishing began when my father taught me how to fish at the age of ten. I started to share my extensive knowledge of all things fishing.

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