After an update from garmin site to CNR NT Navicom 2014.20, I found out next files:
in JCV folder-
D3527060A.JCV
D3527070A.JCV
in SID folder-
D3308080A.sid
D3365070A.sid
D3366020A.sid
D3308090A.SID
D3365080A.SID
D3366030A.SID
in SQLite-
D3368070A.db
D3368080A.DB

Anybody knows what does it mean and is it normal?