What is the cost of the Upgrade/Download
The Navionics Update card is $99 MSRP.
To get to use that card, you need to activate it with a card you already own.
The Hotmaps Premium regional cards have been discontinued.
If you want a regional card, that would be the Hotmaps Platinum South card.
The Update/Navionics+ cards are not regional.
Humminbird Helix 12 CHIRP SI, 1198c SI, 1198c SI, ONIX 10 SI NT, Helix 7 CHIRP SI GPS G2, 360, RC-1