Blowfish, Inside the ICW the biggest issue is licensing. Each and every state now has a salt water
requirement and in South Carolina it is possible that some sections require a freshwater license. I'm specifically thinking of the Waccama river section. Be aware that all fishing limitations, rules, and requirements are not found in the size limit summary sheets
that the states often make available with your fishing license. In NC there are three separate documents which govern coastal zone fishing. There are some closed seasons that are not listed in the summary document and there is an online list of proclamations that can change any other rule
or close a season or fishing area despite what the other documents say.
If you're wanting to fish while underway a simple hand line trolling rig with a spoon such as a clark spoon, will do assuming you are in a sailboat and making 4-7 knots. What you'll catch will depend upon the time of the year. In the winter in Florida
I've had a lot of luck with spanish mackerel in the 2-3 Lb range. You can also catch small blues which are quite good if eaten very fresh. In the spring and summer you can catch the same fish in the more northern reaches. If you are going slower and use an artificial shrimp or Gulp you can also pick up some sea trout. If you plan to fish while stopped, a light-medium spinning rod will usually do in which case casting about with a gulp 3" white shrimp in shallower waterc will often get you a few trout, a flounder or maybe even a slot sized redfish. There is a fishing thread already open where some of the gear
is discussed and I have a link to a simple hand line setup.