How do I update the databases for the GPS devices?

We use the default FSX GPS.

You can find updates for the default AIRAC FSX database on the following link:

http://www.aero.sors.fr/index.html

You can check the following site to update some data of the G1000 (not every data can be updated though):

http://www.gbmitch.net/

(Please let us know if the link is dead so that we may update it accordingly. Thank you)