Hi Mark,
Tshombe with Navionics here. Because you have that old card, the one you want to get is the Navionics Updates card. The old card you have will "activate" that New Navionics Updates card. if you just bought that card (within the last 30 days) and you have a receipt give us a call and we will swap that Premium car out for a Navionics Updates Card...it's a better card for you. Let me know how I can help.
Tshombe Moore
tmoore@navionics.com