Read the statements made by Nissan. Use the search function!Don't know what makes you believe that.
I choose an integrated navigation system with recent maps.Alternatively you could use the existing map and your brain and retain £200 in your wallet. Your choice.
As said before, maps are a servicing part of the car. So new maps are normal and it's a bit strange you seem to find it normal to jump through al kinds of hoops to get the info your navigation should deliver.
Just like not replacing worn tires because you can choose to walk and save the money