This may help.
I found this on a cruising site, may be of some help. Good Dockage Rates at Coquina HarborReceived 11/20/05When docking at Coquina Harbor (north of Myrtle Beach on the South Carolina ICW), we usually stay at the Myrtle Beach Yacht Club. Now, it seems as if one of the "condo yacht clubs" which also makes its home in Coquina Harbor is offering space for visitors as well.At mile marker 346, green 13 is the entrance to Coquina Harbor. Marked by a tall black and white lighthouse. It is about one mile north of the Little River swing bridge.Coquina Yacht Club, monitoring 16 until 8 PM, offers dockage for transients that cost less than a dollar per foot, If you are a BoatUS member. Fuel is available, and there are two great resturants and a store nearby.