Down imaging is a common term used in fish finders. Down imaging is a fish finder feature that portrays picture-like images of structure and bottom beneath the boat on the Display screen. These picture-like photos shown on the screen represent the reflected sonar signals from the bottom in an understandable pattern.


Hummingbird owns Down Imaging as their registered hallmark. Brands such as Lowrance and Garmin also have equivalent Down Imaging application, but they can’t cite the same term for their fish finders. Let’s take an example of Down Imaging feature of Lowrance. In it, this feature is known as DownScan Imaging.


For understanding the working of Down Imaging technology, it’s important to categorize it in two portions. By doing this, you’ll easily get the concept of its working and functioning:

Down Imaging Working

  • Its working will be like taking candy from a baby for you to unravel, but still I’ll unfold them step by step:
  • The mounted transducer propels the sound waves into the water.
  • Sound beams or sound waves after going in the water strike with the underwater objects like fishes, bottom, grass or trees, etc.
  • After striking, they reflect back as an echo.
  • The demonstration of this echo will be shown on the display screen as picture-like images
  • Down imaging displays almost every object underwater as it computes the depth of fish location and capacity of the underwater structure.

Elucidation of Down Imaging View

After getting the Down Imaging view, it’s vital to elucidate, interpret and clarify them. I doubt, in the absence of Side Imaging, it would be the devil of a job to apprehend. Boat is located on the top right corner of Down Imaging display. Literally, a picture is created where the transducer is placed i.e. at the back of the boat. So this should be your transducer’s mounted place.

Object on which sound beam strikes are shown on the screen. One can easily differentiate the diverse objects underwater by their following particular shapes:

  • Clouds-like shapes for batfishes
  • Spindle shapes for large big fishes
  • Trees appear as separate objects

Frequency Usage

Down Imaging generally utilizes frequency of 455 kHz and 800 KHz (i.e. 75° view and 45° view). In less deep water, it goes well. Frequency beam of 455 kHz lends unrivalled depth and picture quality whereas frequency beam of 800 kHz offers piercing image resolution. If we join Side Imaging along with Down Imaging, we’ll most likely see the bottom with a 180° view.

Speed and high-quality image representation are the considerable advantages of Down Imaging over Side Scanning. I’m quite sure that you may have now apprehended the working of Down Imaging with ease because I haven’t told it as a can of worms.