maybe my topic can help you a bit: topic

for Q1: You will be charge if your GPS application establish online connection from your phone to 'assist' faster connection to satellite or download updated map. Charge will be different according to telco data rate.
Most of the GPS-included phone should have option to turn off the "assistance start" in the GPS-related settings such as 'location service'. To verify whether the phone is offline or no online connection, refer to status bar that whether 'online' status exist or not when you are using the GPS application. If there have no such 'online' status than you are are currently offline and thus using the GPS free of charge.

for Q2: It depends on the application you are using. i roughly separate offline GPS application into two types : prebuild and expandable.
Prebuild means it has been made with bundled map and basically cannot put inside other maps anymore. Expandable means you may put desired maps and choosing which map you will using while starting the application. For example: in my topic, GPSmid prebuild version is prebuild application and we-travel midlet is expandable.


I dun know whether the dedicated GPS user will be charged like monthly fee of just buy the device and free of charge to use it. You may google those device manufacturer and see their charge method.