If you use the main database for anything, then you are not getting the updates.
I update the main database because when mobile I often use GPS and the main database.
If you only use the radio to listen to only your favorites lists and check RR website for any changes to your local systems etc, I guess the only thing you need to do is occasionally a firmware update.
As indictated above, only the Sentinel software can update the main database. Because I often build quick favorites lists by appending from main database, that's another reason for me to keep that main database updated.
Mark
536/436/ws1095/996p2/996xt/325p2/396xt/psr800/396t/HP-1/HP-2 & others