I have 2 999HDSI units on my Ranger and fish smaller lakes in PA. I have no current add-on software and was looking for opinions as to which software I should start with if I wanted contour maps of smaller lakes not on the main navionics of lakemaster lists. I've heard about autocharting programs but would any of those allow me access to recorded maps made by other users? The ability to save time mapping myself especially on electric only lakes would be priceless?