Just bought a FF that comes with Navionics+, there was actually a Navionics rep at Cabelas (new one in Garner NC) this weekend and he was very helpful. He said my chip has maps for all of the US but if I wanted I could erase that data and download more accurate maps for local waters. But he also said I could never go back to how the chip was originally purchased (with all of US).

So I'm not sure what to do. I like the idea of updating my chip to get the latest details, but I don't like the idea of a "point of no return". Those usually end up as regrettable moments that cost $$$

So what does everyone else do with their chips?