FS-ATC-Chatter ships with a default COM database which is fairly accurate particularly for the U.S. and Canada. However, there is no guarantee that it will match the simulator you are using.
FS-ATC-Chatter can use a navigation database that can be created from your simulator’s scenery files using the free open source NavDataReader tool. Refer to the FS-ATC-Chatter user guide on how to create this database.
