[Paul Wildsmith]

you don't need to update any of the maps except your region - unless you're travelling further afield. There's no way, or advantage, in removing any country maps you don't need.

Sensus will often say new update available for other countries, but you can ignore if yours's is up to date.

Downloading the map you need onto USB then putting in the car is the best way (though some owners seem to have problems with this, but it's worked for me over last 3 years).