my lowrance electronics though a bit old and black and white has a depth bar to the side that indicates depth of what ever is on the screen not just the bottom, really helps with suspended fish, i just looked at a 700 series hummingbird and it had depth bars that went in 15' increments, not real exact to me, and with down imaging i saw no depth bars at all how do you tell how deep suspended fish are with these units, or can you?