Just moved to Baltimore County (Belair Rd. Fullerton just south of Perry Hall) and I'm programming my scanner. I'm not sure what police precinct I'm in. I looked at the map posted on RR and it seems to straddle both Parkville and Whitemarsh. Can anyone help? Also, when it comes to fire and ems can I isolate to use certain op channels (East, West, etc)? Thanks for your help.