I feel that Humminbird Side Imaging units are VERY MUCH worth the expense. I know they help me catch more fish...by allowing me to pass over large expanses of fishless water and focus on water that is holding fish.
For lots of information on using Side Imaging to identify fish and structure, check out this site and the links contained on it:
Instructional articles for Humminbird Side Imaging sonar units
The clearest Side Images will be obtained when you are moving at a relatively constant speed in an approximately straight path. Gentle turns are ok, quick turns lead to significant distortion. Keep that in mind if you're going to mount the transducer on the trolling motor.


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