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  1. Sirius XM sub needed for nav traffic?

    Newcomers to GM-VOLT.COM (See here for FAQs)
    My Sirius XM trial ends January 27, and I'm probably not going to renew. Will I lose traffic re-routing on the in-dash navigation when I no longer have the SXM? Is there any compelling reason to pay for SXM if I don't care about the radio stations?
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