Nice idea, but not an option. Credit card only. I did change my stored card info to a card that won't work and has an expiration date before the renewal comes up next year.
I would not mind so much if they sent out an email prior to the auto-renewal that informed you the subscription date is coming up and you will be auto-renewed if we do not hear from you, and perhaps a little sentence that said something like "We appreciate your continued business and look forward to continuing to provide our service to you in the future". However, they seem to make it very difficult, and customer service only justifies their way of doing business without any real concern for their customers (in my opinion).
Now that there are other options, such as DeLorme, I will be changing to another service. (Thanks for letting me gripe)