First off, No, I do not have Navionics yet, all I have is the internal map on the Lowrance HDS Touch...
On my Lowrance Map when I'm on Old Hickory, I can clearly see the channel marked in blue. On Thursday when I got to J. Percy Priest the map showed No channel, no blue whatsoever. I have the latest software/firmware update. I'm confused! It's not a setting, all I did was use my finger to scroll down from OH map to view the JPP map.