The head unit comes with the same dimensions for the display, 7-inch diagonal, 800H x 480V pixel resolution, but provides superior images, 16:9, brilliant color and crystal-clear. It’s also LED backlit, which makes it easily readable in harsh sunlight or during night time. It has a power output of 500
This is one of the cheapest units of the new, 600 series, Hummingbird fish finders with Down Imaging. Although it does not have too many navigational options, the Humminbird 678c HD DI sure covers pretty much everything a fish finder should.
Like most units within the Humminbird 600 series, this one comes with a 5-inch diagonal screen, 640 x 480 pixel resolution. It’s a full color unit, with LED backlit screen, making the readings quite easy during night fishing.
Comes with Dual Beam Plus
The Humminbird 386ci DI Combo is one of the cheapest units with Down Imaging available at the moment. Although it’s a small unit, it does provide quite an assortment of features. It’s equipped with a LED backlight, brilliant color screen, 256 TFT, 3.5-inch, 320×240 pixel resolution, with a quick-disconnect, in-dash, mounting system for the head unit.
Has Dual Beam Plus sonar, with a coverage of 200 kHz / 25° or 455 kHz / 16° in SwitchFire, and 455 kHz / 75° or 800 kHz / 45°
The Humminbird 561 DI is one of the cheapest models with Down Imaging. If you’re looking for a Humminbird unit strictly for finding fish, this might be it. Although it features only a black and white screen, 12 LvL Greyscale, it’s quite wide, 5-inch in diagonal, 320 x 320 pixel resolution. Evidently, it allows you to view both DI and classic sonar imaging in split screen.
First of all, the difference between TFT and LED screens is the lighting. TFT screens have CCFL (cold-cathode fluorescent lamps) back lighting, while LED screens, not surprisingly, have LED back lighting. LED backlight screens are a bit more efficient than the CCFL ones since they have less flicker. Also, LED backlit screens consume less battery.