There are two ways to update your Maps.
1. OTA (over the air)
You need a SIM Card with data in your car. You can set your standard region to auto download, but have to download the other regions manually. Take a look into the update App. As nu11eaf posted you do not need much data for those as they seem to be incremental.
2. As Download from Volvos Website and USB-Stick
Here also you can choose between just updating a region and the whole of Europe. But these are not incremental and use much more space.
Personally I update 2 regions I frequently use OTA and only do an Update for Europe once or twice a year.
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XC90 AWD D5 Momentum
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