Llunker
I live in Southern CA and have the 2010 S Platinum Card for Oklahoma and Texas.
First off you need a Gps hooked up and has to have located your current location otherwise you cannot get the map on your screen (at least that is what I found) and it must be in the advanced mode.
Go to the Chart drop down menu, then Chart Select, choice between Auto / NVB / Left (or Right) Chart Card. I have my card in the left slot so I choose the Left Chart Card.
To look at various lake maps I use the (-) key until the area you want to see is viewed. Then you scroll the cursor to the lake you want to look at and zoom in. It is a little bit of a pain but it works.
If someone knows how to load specific lakes please advise, there must be an easier way. Most of the time I use NavPlanner to look at the various lakes, this is a lot easier.
One of the problems with Navionics is they do not supply any documentation on how to use their card.
George