Okay original poster, first of all I wanted to tell you that because you are a newbie your post are going to be delayed showing up on the Forum because you are being moderated for the first handful or so posts, you may have already written one and are waiting to be approved.
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Remember I may not have seen your most recent post yet but this is the radio system that your local fire, police an EMS are on along with St Lucie County.
Your radio cannot be made to pick up this system and even if it could it looks like you've got a lot of secret squirrels in your parts. All the police in your county are encrypted. Anyway it's a moot point to get fire and police.
As has been said, your radio will still get lots of good stuff. Don't know how close to the water you are but there's marine radio, military aircraft, commercial aircraft, ham radio and other things to listen to.
It's best, especially if you want to become a ham radio operator for you to do your own research, better than having someone just hand you a link, it's important to get used to the radio reference site, learn how to use the database, it will give you all of the frequencies you're looking for for ham radio in your area, there are a handful of repeaters right in your county.
Investigate the RR Wiki, so much valuable information. When in doubt Google something. Try Googling Martin County Florida police frequencies and it'll take you right to the radio reference database for your county, then go to the sub menu and you will see all of the systems that serve your county, you will see the above system I posted.
Also look up your radio in Wiki, there are some programming shortcuts, Google user manual for BC 250d and that will give you the manual if you already don't have it.
Every time you come across something you don't understand what it is, search for it on radio reference or just Google it.
Looking things up and research is how you learn, actually being able to program interesting things you enjoy listening to, is the reward.