I agree. The OP is not understanding how location control works.
When you first append a specific department, and/or site, from a trunked system in the main database, to a Favorites list in Sentinel, it does indeed append every single site in the system to your list.
But, all of those sites, that you just appended, are not set to Avoid, which is the correct way they should be if you intend to use location control. If you manually avoid one or more sites, or departments, those sites will remain in Avoid status, and would be ignored when scanning.
To correctly use location control, all of them should be left open (not avoided). Changing or updating your location and range settings in Sentinel will never change that status in Sentinel itself. On the other hand, once your list is actually written to the scanner, if you have location control set as On, then the scanner itself will disable any out of range items when scanning. While it is not displayed that way in Sentinel, Sentinel is not the scanner. It only creates the list that
is sent to the scanner. The scanner will use your location details to determine what is to be scanned, and what should be skipped.
For more explanations on Location control, see
How it Works: Location, Location, Location
I prefer to remove the extra sites, not simply ignore them via setting them as Avoid. Since I almost never use location control (I make my lists based on what I know I can receive at a given location), having that extra clutter of unused sites (even if avoided) is useless.
Correct. Sentinel is an essential program for any of the Uniden database scanners. You need it for maintaining the man database, as well as any firmware updates. (There's been a drought of updates since the untimely passing of UPMan, but JoeBearcat has indicated that some may be in process.)
scanman, your profile indicates that you are a Premium subscriber. As such, you can use either
ProScan or ARC536 to download
only the systems, sites, and departments that you want into a Favorites list. Instead of appending the whole smear from the main database in Sentinel, import only the specific items you want using the web import.