Which do yall use and like the best? Most of my fishing is southern middle tn with a few trips to Wilson lake a year.

I use Navionics, but I run Lowrance units. If I were you, I would compare the lakes I was going to fish, and see which chip covers the most. If you have coverage on both chips, look to see which offers the"HD" lakes.

I use the Lakemaster card in my Birds. I love it.

I use Navionics in my birds...but have been thinking about the Lakemaster as well

Going to be running humming bird units. This may be a dumb question but, this is my first high dollar unit purchase. How does one figure out which lakes are covered in hd?

You should be able to go to humminbird.com and view the lakemaster section to find out the hd lakes.

I like that I can adjust my target depth ranges by the foot for when Im looking for certain depths. Doug Vahrenburg on youtube has some helpful videos on youtube for lakemaster and humminbird that may help you.

I learned alot of tips etc. from Doug over on BBC

He's dang good.

After some looking around at the lake master on bbc my three main lakes are not offered so navionics it is. Thanks for the help guys.

What are your main lakes?

Lakemaster has 13 Tennessee lakes listed, 6 of which are HD.

Woods res. it's hd, Normandy, tims ford, and sometimes priest in early spring before the lake lice show up! These are with navionics.