Guys I have both Navionics and Lake Maps. If you want to compare them on a lake you fish come by and we will look at it on both maps and you can see before you buy. As far as Greers the Lake Maps is best. The Big Four in MS are not on the Lake Maps card for that area which make no sense.
Are speaking of Lakemaster? If so the reason they are not on there is they have not been mapped. Lakemaster is currently in the process of mapping butla with the others to follow.