When I use a Side Imaging product am I missing critical information directly under my boat?

The area under the boat that isn’t covered by the side imaging beam is very small (approximately 5 degrees to either side of vertical). The conventional down-looking sonar that is built into the side imaging transducer covers the areas below the boat and the Side Imaging Units allow you to view a split screen that will show both 2D coverage and Side Imaging sonar simultaneously.

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