Check to be sure your lakes are included in whichever you choose.  I made the mistake of getting Lakemaster v 8 only to find it does not include my home water- which has a six lane town launch and at least five other single launches throughout the flowage.  It does, however, have a nearby town park lake mapped which has no public access.  Glad I still had my old Navionics chip which works in my new console Helix 7.