At the time Coastguard issued an urgent plea for information about the driverless vessel or its owners.
But it wasn't until three hours after the alarm was raised that the man, who had started his boat about 20m off shore then fell out, realised all the activity on the harbour may have been in relation to his missing boat that he contacted authorities.
Ms Smith said it served as a reminder to boaties that if they were involved in something unusual on the water, and particularly when they became separated from their vessels, to contact Coastguard and police and let them know the situation.
"We were delighted he was safe on shore. We take these calls seriously and respond immediately so if there is an incident and people are safe please call us."