Hi Rick -
Welcome to SC and to RadioReference. Happy to help.
So, Law enforcement in both Beaufort and Jasper Counties are fully encrypted. That includes both Sheriff's depts and all municipalities. In Beaufort County, EMS Dispatch/Ops and several of the Fire Ops channels are also encrypted. That's the bad news.
However, Beaufort County "South of Broad" (which is the Jasper County side of Beaufort County) is covered by Bluffton FD, which does not seem to use any encrypted Ops channels, and Hilton Head Island Fire/Rescue is also in the clear. Jasper County Fire and EMS are also in the clear. All of these agencies use the Palmetto 800 system.
Beaufort County is one that uses a simulcast P25 trunked radio system site, so if it's your focus for monitoring, you'll want to consider a radio that supports simulcast well, which right now includes the Uniden SDS-100 or 200. A BCD996P2 will fit the mold if you happen to be in an area that doesn't really suffer from simulcast problems. You won't know that without purchasing a scanner, programming it, and trying it out.
Worth noting, the Beaufort County Palmetto 800 site site #1-63 is a county operated site which is managed separately from the rest of the Palmetto 800 system. This means that you won't hear Beaufort County agencies on other Palmetto 800 sites (like the Jasper site #1-50, Bluffton Site 1-61 or Yemmassee #1-49). Likewise, you won't hear Jasper or Hampton County agencies on the Beaufort site. If your interests are to listen to Beaufort County agencies AND Jasper County agencies simultaneously, you'll need to program your radio in such a way that it forces the radio to scan the Beaufort County site as an independent system.
Feel free to post in the SC forum for more details.
Good luck.
Brian