sygic downloader ... i use that one only. it comes with it when you install sygic.
as per what describe at sygic page for registered users.
Map download process
All maps are downloaded using application called Sygic Downloader that was installed during installation of Sygic application. It is not necessary to download all maps included in map package you purchased, because you can add or remove maps anytime you need. It is not possible to download maps to PC. If you have problems to download map, trying different WiFi connection may solve problem. We recommend to use wifi connection better than 3G network.
Downloading additional maps
If you decide to download new maps that are not part of previously purchased map package, you need to purchase also additional license, which will include these additional maps, from
http://www.sygic.com/en/android:buy-now. After purchasing additional license enter product code in application main menu -> My Sygic -> activate product. Active Internet connection is required during this procedure.
Map updates
Since version 11.2.5 (Android version) we are using latest Tom-Tom maps from 09/2011. All map and software updates which will be released are provided for free.
Update notification
You will be notified by android market about availability of new update. It depends on settings of your Android market. To receive notifications about Sygic updates go to Android market -> settings -> enable "Notify me about updates to apps or games that I've downloaded." In this menu you can also disable option "Automatically update apps by default" and enable option "Update over WiFi only". These two options prevent application from starting updating process while you are using application during driving, connected to 3G network only.
but those update only occurs when the app itself is updated right? like when u update 11.2.5 to 2.6 it will only update, other than that the map won't update without updating the version is it?