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Unfortunally, I contacted Sanyo, and there are no new updates for your GPS, I looked on a forum about the GPS unit you have and appearently there are lots of people waiting for the same update for many different reasons.
When an update does come out, it will be here http://www.easystreetnav.com/
If this answers your question please click Accept, if not let me know how else I can help
If I was you I would call SANYO and complain, there are people that have the same GPS adn there are many streets missing.
Sorry I couldn't be more help. If this answered your question please click Accept.