BMW should make it more clear regarding how the navigation map is updated as I wasn't sure either when I first got my car.
In the US, the only map updates that update over the air are the regional maps and you can select your region here (it's under map update):
https://connecteddrive.bmwusa.com/ap...x.html#/portal
In the US, the entire map though needs to be downloaded and uploaded to the car via USB.
The above may be different for your father though since you're not in the US.
Pull up the navigation (the actual map) on the iDrive screen and then once you're there, press option on the iDrive controller. There should be something called software information- press that and it will give you your navigation map version (mine is 2016-4 so I need an update):