As I understand the bc436hp all you need to enter is the zip code for the area you live in. If you are using a software program you can get the information for the agencies you want to listen to from the database.
Hope this helped
Here is a link to Mark' s Scanners Easier to Read BCD436/536 Digital Scanner Manual
This may help you a little more. I would say from reading the Auto Locate you should be able to pick up other
areas while traveling I hope someone will jump in to help with your questions