The lifeboat was launched at 8.13pm on Monday after the UK Coastguard received several 999 calls reporting 3 people waving for help in a blue dinghy off Tankerton.
The lifeboat located the persons aged between 17-25 years in the water 300-metres off the Tankerton Bay sailing club.
The three were requested by the lifeboat crew to return ashore where the Herne Bay mobile coastguard gave further safety advice.
Crew: Rob Judge, Dave Parry, Ben Crosswell and Tim Smith.
Launchers: Andy Clark, Andy Williams, Stuart Enderby, Andy Mayo, Craig Sidders, Alex Quan and Ruth Oliver.
Weather: South Westerly force 2 winds.