Erie Lowrance CMap or Navionics Card

[Prkr314]

Just wondering, why would you need a chip in an HDS unit? It already shows all the reefs. What else do you need to know? Or are you coming to bass fish?

[Fastfreddy]

When I fished a lake up in South Dakota without a chip the lake was a big blue blob. It didn't show me anything... I did have my down imaging but had to guess where all the drop off points were. I had zero contour lines!