Micro SD card for the car Garmin Sat Nav, size?

Can’t remember if a 16GB card is enough space to download updates in the future & European maps, and does it matter what class it is? Is a class 10 necessary?
Thanks

16 Gb is bigger than I’ve ever used before with european mapping and go with the quickest you can.

The map for the *whole* of Europe is less than 4Gb, 16Gb will be more than you’ll need. Be aware that there might be a limit in terms of maximum readably size, so it might be best not to go bigger than 16Gb.

Cheer guys, I couldn’t find anything in the online manual but found their customer service number in the box so tried that.
The guy said max size card is 32GB but 16GB is more than enough.
Europe maps are 7GB plus some there are some other smaller updates so will need more than 8GB.