Hummingbird Fish Finder 688ci HD DI Combo

Hummingbird Fish Finders - 688ci HD DI Combo

The Humminbird 688ci HD DI Combo is one of the new 600 series fish finders. It shares many similarities with the 788ci HD DI Combo, but it’s considerably cheaper.

This unit has a 5-inch vertical layout screen, 480 x 640 pixel resolution, with a backlit, 256 color display (TFT). As its name suggests, its a High Definition fish finder, even though it’s a smaller unit, and does provide crystal clear images.

In terms of sonar capabilities, the 688ci HD DI Combo is equipped with the standard

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Dual Beam vs Tri Beam Sonar

If you’re trying to decide between a dual beam and a tri beam sonar fish finder, to make sure you get the one that fits best to your needs, I hope this post will help.

First of all, this is how a dual beam and a tri beam works.

A dual beam sonar projects two concentric cone sonic beams into the water, directly under the boat, under the transducer, to be more specific. One is wider, with a 60° opening, and will help you find stuff faster, because it scans more water. However

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