+1 on this,
personally i think the nurrish nav is a PoS but many seem to like it, the cookbot setup is far more solidly built and less likely to give you any issues.
Not really a viable option for satnav though... it uses your 3g connection via a dongle so if you dont have unlimited data or get stuck somewhere with a poor signal your a bit stuffed thats why i did my own
Cookbots is a nice set up but i just wanted a nav
Ive loaded the maps onto my cookbot, so I dont need a data connection.
You only need a data connection if you intend to stream maps.
As Chesterfield said, if maps loaded on no need for a data connection. I also have a Cookbot system fitted, satnav works very well. Plus you can add to the system what you want at any time via download.