It is likely the 'Chart Boundaries' that are driving you nuts. If you zoom out, they are a series of red boxes that show the boundaries of the different paper nautical charts and really aren't much use on your chartplotter. Turn them off by selecting "Chart -Chart Options - Settings - Chart Details - User" and uncheck the 'Chart Boundaries' box. (This is the menus for HDS units, it may be slightly different on the Elite unit).