The map shows South Carolina as requiring boater education. Here is the regulation from the DNR website:
Who needs a Boater Education?
Boaters under 16 years of age are required by law to pass an approved boater education course before operating, without supervision, a personal watercraft (jet ski) or a boat powered by 15 hp motor or more.
This means a person sixteen years old or older does not need to pass an approved boater education course to operate a boat in SC.
So while the map is not incorrect, it implies that boaters in SC have passed an approved boating course when in fact, the vast majority of boat operators in SC are not covered by the requirement. It's an example of a way to use information in a misleading way.