HI All - new owner of a 2017 C300 prewired for SD-Card navigation (Code 355). Where can I get the most up to date version?

 

You can purchase the SD card from the M-B dealer ($600) or from many of the eBay sellers ($120-180). Make sure the SD card part number is correct for your vehicle. The current versions sold are either V5.0 or V5.2 (2015/16). You can go to M-B Garmin download site to update the card to the latest version, which is V8.1. Please note some members, including me had difficulty with update, while others were successful. Please read more about the update on the thread in GLC (X253) forum.

https://mbworld.org/forums/glc-class...t-version.html