For Garmin Pilot SD card (US version), the current updates available are: Software V8.1 SW37,15,17/02.00, E70.2 (575 MB). Map : 2017 (V8.1) N. America (18.87 GB).
Following is the information from M-B Garmin site regarding updates:
"Use the Mercedes-Benz Download Manger to check whether you are eligible for free software and map updates. Click on the "Start Download Manager" button above.
Information about free software updates:
The Garmin® MAP PILOT navigation software is regularly updated and improved. Installing a software update will bring your navigation system up to date and ensure that you continue to enjoy optimum performance. This service is available free of charge. Make sure to check regularly that your navigation software is still up to date.
Information about free map updates:
Congratulations on choosing the Garmin® MAP PILOT! You may, however, have found that the pre-installed map material on your genuine Garmin® MAP PILOT SD card is not the latest version. If so, it's not a problem – if new map material becomes available within 60 days of your first using the system, you will be entitled to install it free of charge!
Information about paid updates:
If there is no free map material available, you can purchase it at your local dealer in the form of a Garmin® MAP PILOT Update SD card. Contact your local dealer for further details.
Here's how it works:
Insert your genuine Garmin® MAP PILOT SD card into your PC, start the Mercedes-Benz Download Manager and download the free offers".
Please be aware that some people had trouble getting the download completed after several hours, while others were able to do it less than 1 hour.