It does sound like the key not communicating with your immobilizer system. Unfortunately, there are very few workarounds. Due to your remote location, I would highly recommend you invest in a vag-com unit. You can take care of minor issues yourself, and it would be extremely valuable for diagnosis. (Which could save you the ferry ride) With this unit, you can program your own keys and remotes, pull diagnostic codes, reset computers, etc.... It's a little pricey but in your situation it would make a lot of sense. The system can be purchased from Ross-Tech
Ross-Tech: Home
Good luck,
- Craig
Discount Volkswagen Parts