With my rookie experience with scanners, 9 months now using my BCT15X, I find that sometimes if I leave out the PL tone and just use "search", I get hits from different agencies/fire depts/police/EMS/etc...just on one frequency.
I try to listen as best as possible and make notes as to which tone # gets a hit and from where/what area it is coming from.
As far as updating the database: near the top of this Web page in these forums, you'll see a blue bar going across the top with different labeled "links". Look for the one that's labeled "Submit Info", click on that and follow the instructions.
After you've done that, read this link here ~~~> Have a question about your database submission? *PLEASE READ*