A woman from Harbor Island drifted on a raft for about five hours on Saturday before a boater rescued her more than four miles offshore in St. Helena Sound.
Skipper Paul Field of Fripp Island Sea Rescue said the woman was dehydrated and sunburned but required no serious medical attention.
She put her raft in the water at about 1 p.m. and was pulled by the tide far off shore before a boater found her and brought her close enough to shore for rescuers to take over, Field said.
"The good Samaritan did all the work and may have saved her life," Field said. "No one knew where she was."
Fripp Island Sea Rescue volunteers took her to an EMS station before dropping her off at her Harbor Island home.