Sonar noise appears as dots or vertical lines on your sonar display, and can be caused by the following conditions:

  • Very thick ice when ice fishing
  • Other sonar units / fish finders operating nearby
  • Murky water
  • Obstacles like edges of a boat or pier
  • Currents

Thick ice when ice fishing

Deeper Sonars will perform fine in thick ice up to roughly 1 m / 40in, although some sonar noise may occur.

This occurs because some of the sonar pulses are reflected from the edge of the ice hole, causing small inaccuracies on the top part of the sonar screen. This will not affect the depth or structure reading function of the Deeper, and you can still easily mark fish and see your jig. If you wish to reduce this sonar noise, widen the ice holes you are fishing and position your Deeper directly in the center of the ice hole. Furthermore, it is important to always use the Ice Fishing Mode on the Deeper App.

Other sonar units operating nearby

Deeper sonars transmit ultra sound in the form of a cone, like most other sonar units. If the sonar cones of different sonars interfere with one another, both units will experience sonar noise.

To reduce the amount of sonar noise, make sure you are using the narrow beam of the sonar, and try to stay as far away as possible from other sonar units. Reducing the sensitivity of the sonar can also help.

Murky water

Due to the high density of murky water, sonar waves may reflect from it, causing sonar noise or clutter. Try reducing the sensitivity of the Deeper as this will reduce the amount of sonar noise.

Obstacles nearby

Any hard obstacles nearby such as boat or pier edges can cause sonar waves to reflect from them, resulting in sonar noise.

If this issue occurs when you are using your Deeper mounted to a boat, try to adjust the position of your Deeper so the sides of the boat are not interfering with the sonar cone.