Just about every fishing boat in the world carries a colour echo sounder.

Fishers are now able to obtain more information about fish targets and bottom structures than manufacturers ever believed possible. This book explains how these systems work, how to operate them and how to interpret the information recorded on the display monitor. This book is evidence based and does not contain any mysteries or secrets, only facts. How to Use an Echo Sounder/Fish Finder second edition now includes Imaging Sonar and CHIRP.