I bought for $240 the Navionics charts update CF card plus the latest software update for my Raymarine C120 chartplotter. The software update and charts installed just fine on the lower helm C120. How can I update the charts on my Flybridge C120 display? I called Navionics and I thought they said I could simply buy a similar 2GB CF card, which I did, and then download the new charts from my Navionics account. However, that does not appear to work. Any suggestions?