I recently bought a hummingbird GPS/fishfinder that is navonics compatible. I am looking at purchasing the hot maps platinum chip in the next few days. How does that chip perform on Green, Barren,Rough and Nolin. I want to see the detailed contour lines and want the chip to be accurate. For 150.00 dollars I want it to be worth the investment. I have seen mixed reviews but nothing for this area. I will be purchasing the east edition. Any help will be appreciated.