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,