I have never owned a scanner and I am really confused as to finding the one that fits my specific needs. I live in Florida, Palm Beach Gardens. I am interested in listening to their frequency mostly but also other local departments such as Sheriffs office, Riviera beach, etc. How do I know which scanner will meet my needs? How do I know if a department's frequencies will be compatible with the scanner I purchase.? The last thing I want to do is purchase a scanner and it doesnt work with the police frequencies I put in.