I obtained the Ray Bob brush pile coords from someone on this forum a few years back. I punched them all into my old humminbird at the time and used them for several years. I just now thought about the guy who bought my old boat and graphs. He has a gold mine of crappie spots on lew and Ray Bob now.
If your fish finder has GPS I think your better off that way. Fishing ledges and humps is easier done with a GPS map on a fish finder if you ask me. if you want to do it on the cheap just download the navionics app on your phone. You can do the same thing with it.