I have a Raymarine 435i with no charts in it. Manual says Navionics gold card. Some places say no 1XG, 2XG. I got a card that is a "XL3 Classic or Gold" 1G905XL3. In the plotter it comes up "No chart files available". In a card reader on my computer, the files show up. I tried opening them with Open CPN and SeaClear and can't do that or don't know how. Anyone got any ideas?