As soon as you have bought sygic, you get the url for a repository (catalogue). You will get notifications for free updates of the application. For updates of the maps, you will have to pay.

Sygic uses AGPS, and is really fast in getting your position, as long as you have internet connection.
HOWEVER, as soon as I cross the border into another country, 3G internet connection becomes very expensive. So, I switch off the 3G connection. No email, no websurfing, only in hotels or other places with wifi-connection.
With 3G switched off, sygic starts to show annoying connection dialogs. The program will ask over and over again to choose for an internet connection. To get rid of these messages while driving the car is very annoying.
I tried to switch off agps ( in settings - location), but sygic persisted in asking for a connection.
Does anyone know how to switch this off ?

In sygic you have downloaded all maps you bought; the app has no need to download maps from the internet.

I find sygic to be a good an reliable navigator. Very occasionally there is an error, but not more or less then other navigation programs.