Before you start using your Deeper device, it is important to understand some basic points about how sonars work.


1. Sonars scan in cones. 

This means when you mark a fish or feature, it is somewhere within the cone sent down by your sonar (not necessarily directly below your sonar). It also means that the deeper you scan, the wider the area you cover, because the sonar cone gets bigger as it goes down.



2. Sonar displays constantly scroll


When your Deeper is in the water, the sonar will be scanning constantly. This means the display continually scrolls from right to left, even if the sonar itself isn’t moving.


Read our page on how sonars work for a detailed explanation of these points, plus lots more useful information that will ensure you understand your device correctly.