Consider using this as a reference first:
http://www.radioreference.com/forum...n-forum/10846-how-scan-sc-highway-patrol.html
SCHP comms are carried on the
Palmetto 800 statewide TRS.
Here are the dispatch talkgroups from south to north on Palm800:
30096, 29968, 30352, 7152, 29200, and maybe 29584?
Here are sites to monitor (there may be others, I'm just going off a quick glance at the coverage map):
37-Bluffton, 51-Jasper, 33-Yemassee, 10-Canadys, 11-Holly Hill, (23-Orangeburg), 53-Manning, 54-Lee, 56-Darlington, 40-Marion, 60-Bennettsville
Other SC guys feel free to join in if I left off any talkgroups or sites.
Hope this will get you started. Many county agencies are on the same system as SCHP and are sorted by county on the Palm800 database page. I often like to scan fire dispatch channels when I travel.
Let us know if you have other questions.