RedactedNarrative: V-1 was traveling North on the Intracoastal Waterways. V-1 was in the channel on the west side. V-1 approached red day marker #228. V-1 hit the day marker head on ejecting all three occupants. V-1 at this time was in gear and running with nobody aboard the vessel. The vessel continued to go in circles before running aground at the Stuart Causeway. There were a three fishermen fishing at the Stuart Causeway. The fishermen did not witness the crash but saw the runaway vessel going in circles. The fisherman came over to the runaway vessel and observed nobody was on board. The fisherman located one of the occupants swimming in the channel. The fishermen pulled the occupant out of the water into their vessel. I arrived on scene at the time the last two remaining occupants were located. The other two occupants were holding onto marker #228 fighting against the incoming current. The fishermen were pulling the other two occupants out of the water when 1 pulled up to their vessel. I followed the fisherman with the occupants to the Stuart Causeway docks. The occupants who were ejected refused Martin County Fire Rescue and advised me they had no injuries. I spoke with the owner and operator of the vessel. Operator1 told me he was traveling north towards the Stuart Causeway and saw a day marker at the last minute. Operator1 tried to turn hard to starboard but it was too late with the incoming tide and wind blowing from the east. Operator1 advised they hit the marker head on. Let it be known there was a strong incoming current and east wind blowing from 20-25 mph causing choppy waters. Operator1's boat which had his dog inside uninjured was removed from the beach back into the water and placed on a trailer. No further information.