Re: Navigation & gps software and skill
There are two different approaches to Satnavs on smartphones - ones where, each time you plot a journey you download the maps as you go, and so depend on a wi-fi or data connection througout the journey. If you use the data connection for this, it comes out of your monthly data allowance. Google Maps is an example.
The other type is where you install the maps for the whole of your country when you first install or update the product - takes up space on your phone, but once done you don't need a data connection unless you use live traffic alerts.
I use the latter - CoPilot. It works well, clear voice instructions and maps. There have been some instances where, when I have known the area well, I would have chosen a different route (and it lets you tell it to do that). I presume this means that when I don't know the route myself, it may sometimes miss the BEST route, but you know it will get you there! When I bought it I got the UK only version, but at any time I choose I can add maps for the whole of Europe and/or the whole of USA.
The current PC Pro magazine has a review of some of these products.