What Lowrance Chip to get?

Just bought an Elite 5 and what chip is the best one to get. I live in Columbia, so I fish Lake Murray a good bit, and I go offshore out of Edisto and Charleston a few times every year. Thanks for any input.

I like the Navionics chips. However, they do a coastal version and a lakes version, so there is not a one chip solution. I have Hotmaps Platinum East for Lk Mry