Humminbird mapping is all on a per user basis there is no place to download maps etc other then to buy a navionics card.
If you know someone with autochart maps already built I believe it is possible to transfer them but I don't know the exact procedure. I believe you will need a zerolines card and at least one of you will need autochart or autochart pro for computer as the process would be to upload data onto computer then put the map onto your card.
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