Do not bother buying the lakemaster chip unless the lake(s) you fish are listed as HD maps. If it does not say HD on the map list DO NOT waste your money because it will give you a worthless 40 foot contour spacing. Currently Kentucky Lake is the only HD map in KY on the southeast lakemaster chip (double check me on HB website)

Also, they mapped Green River lake last spring so it is HD but does not come with the standard chip. It must be purchased separately and added. So unless you fish Kentucky Lake only then don't bother with the Lakemaster and get Navionics.