I have the navionics east chip and it has all major lakes in the east region. I bought the south region to use when i come to Florida because the east map stops at SC. Okeechobee is very detailed on the south map but the Everglades are not. The east chip has all the significant lakes in SC on it, so I would think same was true for the south chip. I only fish Okeechobee and the glades