Today's sonar technologies are rapidly developing and in may cases becoming prohibitively expensive for many if not most anglers.
Though this is the case with mega-display and "live scan tech units", sonar systems with traditional 2D (colored display), down imaging (DI) and side imaging (SI) on 7" display models are relatively affordable.
But are DI and SI really needed?
It depends on whether or not you're willing to learn how to use and interpret the information on the displays and here's a great video to begin the learning process:
Definitely provides some great food for thought :)
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