Some just need a classic 2d sonar with depth, vegetation and temperature at their disposal and some require charts. In this category, you will find combos where you have both plotter and sonar in the same unit!
Many sonars have a function that shows the side view to the right and left of the sensor in addition to the classic view straight down. All brands have different names for this function, it can be called Sideview, Sideimage m.m. Its function is the same and you will find all these weights with such a function if you filter on Page View.