I use my phone, my maps on the depth finder and google earth all the time. best thing to do is go find those places on the map in your boat and see how close it is and you will learn what it is trying to tell you. 3 years ago I couldn't imagine using a map on every lake I fish now I cant imagine being without it. Hope by spring I will have access to Naionics (already using), the new LakeMaster card for the South and Lowrance insight. they all show different stuff in different ways, the older Lowrance maps showed you OLD road beds and the old house places before the lake was ever formed, that hard bottom is a game changer some days and its handy to know where it is.