I've got a 9ti. It came from the factory with a Navionics card in it. I've been trying to make shading of depths work but when I touch that menu button nothing happens except that a red triangle shows up in the lower right corner. I assume this means that feature does not work. Do I need to buy a better map card or is it the 9ti that is limited? That map card does show contours on it on the screen.