Re: Formatting old Navionics Navchart card as a data card???? I'm not sure but I think you can return your old card to Navionics for a $75 refund. I picked up a couple blank data cards on ebay for about $5 each. I think West marine has the return forms for the card. The cards are not typically read only and you should be able to format the card in just about any card reader. Good luck.
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