Do you have charts for any of the lakes in the northeast? I have a Raymarine 435 GPS with the USA east 16xg card that according to Navionics is not compatible with the GPS for lake coverage. They quoted me over $200.00 for a Navionics+ card that apparently is the only one capable of displaying lake charts on the 435. You might want to check with Navionics tech support for assistance.... they are quite responsive.
Note: I decided to wait and treat myself to the new Raymarine A78 series for Xmas rather than spend over $200.00 to support a 9 year old GPS.
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