When looking at side imaging, do you have to take the water column into account when figuring out how far away a piece of cover or structure is? For example, let's say I have the side imaging shooting out 100 feet to each side of the boat. The water is 20 feet deep, and I see a big tree halfway between the boat and the 100 ft mark on the left side of the screen. Is the tree 50 feet to the left of the boat, or is it only 30 feet to the left since the first 20 feet of side imaging shown on the screen is the water column?