Hi Liam,

It should be technically possible to retrofit satnav to your car, but we'd advise against it, as there is likely to be a lot of extra wiring and hardware needed other than just the head unit. It would be a very expensive exercise and one that wouldn't add value to your car, so you'd never recoup the costs. 

While not as well-integrated as an official unit, I'd suggest you're better off with a third-party system, or use an app on your smartphone and a phone holder for the dashboard.