chart for Raymarine fishfinder

I just got a Raymarine A50D that came preloaded with “U.S. Inland Lakes and Rivers”. I almost always fish either Lake Moultrie for bass or Bushy Park fresh and salt side. Is there a worthwhile upgrade with especially more Lake Moultrie detail?

I just got a Lowrance Elite 7 HDI without anything but what you have . When it shows a decent map , which it does I don’t think so ,unless the money is burning a hole in your pocket. I get real good detail of the contours of the lake bottom . my 2 cents

much appreciated. 1st time with color and gps/chartplotter after many years of black & white and no gps. I’ll have a lot to learn.