The E80 will display .BMP files (a type of graphic file) linked to registrations. You can scan your charts, save as .BMP and import directly to the E80.

The E80 manual is available at roland-arranger.com if you need to get more info on how this is done...

The G70 does not have this capability (sadly!).
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An arranger is just a tool. What matters is what you build with it..!