I did it with the tutorial in the DIY section of this forum. At the same time I removed the restrictions on using nav while moving, and also the nag screen is gone. And it was free
Have a look in the DIY section for the walkthrough, if it's too complicated you could always come to one of the KW meets and I can help you do it (takes about an hour and a half).
The map update is not bad, still seems out of date but it's a little improved in terms of navigation.