Never used satnag of any type?

I would be literally lost without mine ,despite any shortcomings. They are invaluable for finding your way through an unfamiliar town, and finding locations where you might have to follow contrary one ways streets etc. Safer too as you can concentrate more on other traffic and make decisive turns etc. Confused drivers, bewildered ,dithering , unsure where they need to go and getting increasingly stressed can be a real menace.
Also helps with rural locations where a postal address is too vague to be of much help. As with other driver aids you need to remain in control and use common sense at times rather than blindly following its every 'command' .
Unless your driving rarely takes you into unfamiliar locations you really are missing out on a useful aid. They do take a little bit of getting used to. My wife has not much experience following satnav whilst driving.