If I understand correctly this updates any changes in frequencies to the items listed under my favorites.
Any favorites lists in your scanner will not receive any updated information from the weekly updates, Sentinel is designed not to update favorites lists on purpose... if you had customized a lot of data in your favorites lists (agency names etc.), Sentinel would overwrite all of that each time the database was updated. If there have been updates to any of the agencies contained in your favorites lists, it is necessary to update those manually using Sentinel's Favorites List Editor.
Erasing Favorites Lists from the scanner when writing to it insures that you don't end up with duplicate favorites lists in the scanner, but it doesn't send any updated data unless you have manually updated (or added to) your favorites.
It's not necessary to check the "force write full database" in Sentinel unless you are trying to over-write the master database in the scanner with one of
the same date from Sentinel. The only time you would need to check that box would be if the master database in the scanner had somehow been corrupted (for example... a bad SD card), and you were trying to re-write the
same date database to the scanner again.... a very rare instance.
Once you update the database in
Sentinel with the new weekly update, and Sentinel sees that it has a newer database than the one in the scanner, just writing to the scanner will
always (force write) overwrite the older one in the scanner without having to check that box.
When Sentinel sees that the scanner has the same date on the database that it has in your computer, it won't write that database to the scanner again. Each time you write to the scanner for adding frequencies etc, as long as the database dates in the scanner and Sentinel match, the main database in not sent to the scanner again.
