I don't know about the Navionics but *most* manuf's of these allow you to purchase a "user card" and you can save data to it. Your machine might have 2 slots (one for map and one for user..or two maps...ect) , if not you my have to remove the map card and install the user card.
Time to dive into the manual, and visit the web sites...there has got to be a way to get the saved data out of that box....even the handhelds can do that.
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