Can I update the SD card from my Mercedes navigation system and renew my TomTom subscription

knowsnowt
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how do I update the SD card from my Mercedes navigation system and renew my TomTom subscription
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Thanks, rider1rider.
Links say C Class 2018 no product? Maybe the map is up to date but I want to renew the tomtom subscription.
Does this have to be done via merc or can I do it direct with tomtom?
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