Ben, the MarCum LX-i is for telling you depth. It is a super powerful (2500 watts) handheld unit. The best part of the unit is it will read actual bottom, not weeds etc. The display is on the top so you can read it looking down at it (very nice)
Also, it has a fish mode that it goes into after it detects bottom. In this mode it may read weeds/fish/etc. I really don’t use that mode, my main concern is the depth. You will be happy with this unit. It still takes a little water to read through the ice (or some spit). I use my LX-i all the time, even thru thick ice.