My mapping will not work with my Lakemaster chip OR my Navionics chip. When using Navionics it is just a white screen where all the water is and shows my way points. With my Lakemaster card the screen will flash up without contour lines and then go black. I have read every forum I can find, tried resetting the unit, even followed other advice to delete all Nav Data and then turn the unit off and back on. Nothing seems to work. Have a tournament this weekend and need to figure this out and I am looking for any advice on how to fix it? Was told to post it here and ask Wayne for help.