Best maps?

I have the hb598 & 597, what is the best map card for Kentucky lake and Pickwick lake area?

Lakemaster for the 98. It might lag a little on the 97. Southeastern states

Thanks for the reply. Thought there would be more after 88 views. Guess no one uses maps.

i have the new lakemaster chip with ky lake on it..really like it on my 597hd di just my opinion tho